Python

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In Python, we will address the problem of intersecting two dictionaries via their keys. As a result, something in common between the two dictionaries is required.

You’ll come across a concept called Python dictionaries here. Dictionaries are a relatively prevalent data structure in the Python programming language.

Before going further into it, let us first talk about dictionaries.

Dictionaries:

Python dictionaries are mutable collections of things that contain key-value pairs. The dictionary contains two main components: keys and values. These keys must be single elements, and the values can be of any data type, such as list, string, integer, tuple, and so on. The keys are linked to their corresponding values. In other words, the values can be retrieved using their corresponding keys.

A dictionary is created in Python by enclosing numerous key-value pairs in curly braces.

Examples:

Example1:

Input:

dictionary1 = {'Hello': 'one', 'this': 'two', 'is': 'three', 'btechgeeks': 'four'} 
dictionary2 = {'good': 'five', 'morning': 'six', 'btechgeeks': 'four', 'is': 'three'}

Output:

The given first dictionary =  {'Hello': 'one', 'this': 'two', 'is': 'three', 'btechgeeks': 'four'}
The given second dictionary =  {'good': 'five', 'morning': 'six', 'btechgeeks': 'four', 'is': 'three'}
printing the intersection of the given two dictionaries =  {'is': 'three', 'btechgeeks': 'four'}

Example2:

Input:

dictionary1  = {'Hello': 'one', 'this': 'two', 'igs': 'three', 'btechgeeks': 'four'} 
dictionary2= {'good': 'five', 'hello': 'six', 'igs': 'three'}

Output:

The given first dictionary =  {'Hello': 'one', 'this': 'two', 'igs': 'three', 'btechgeeks': 'four'}
The given second dictionary =  {'good': 'five', 'hello': 'six', 'igs': 'three'}
printing the intersection of the given two dictionaries =  {'igs': 'three'}

Intersection of Two Dictionaries via Keys in Python

Below are the ways to find the intersection of two dictionaries via keys in Python.

• Using Dictionary Comprehension
• Using & Operator

Method #1: Using Dictionary Comprehension

Approach:

• Give the two dictionaries as static input and store them in two variables.
• Next, take dictionary1’s key as x and perform a for loop to see if the x in dictionary1 also exists in dictionary2. If it does, the common key and its value are moved to a new dictionary named intersectdicts.
• Print the new dictionary intersectdicts with the common keys and their values.
• The Exit of the Program.

Below is the implementation:

# Give the two dictionaries as static input and store them in two variables.
dictionary1 = {'Hello': 'one', 'this': 'two',
               'is': 'three', 'btechgeeks': 'four'}
dictionary2 = {'good': 'five', 'morning': 'six',
               'btechgeeks': 'four', 'is': 'three'}

# printing the original given two dictionaries
print("The given first dictionary = ", dictionary1)
print("The given second dictionary = ", dictionary2)
# Next, take dictionary1's key as k and perform a for loop
# to see if the k in dictionary1 also exists in dictionary2. If it does, the common key
# and its value are moved to a new dictionary named intersectdicts.
# intersection
intersectdicts = {k: dictionary1[k] for k in dictionary1 if k in dictionary2}

# Print the new dictionary intersectdicts with the common keys and their values.
print("printing the intersection of the given two dictionaries = ", (intersectdicts))

Output:

The given first dictionary =  {'Hello': 'one', 'this': 'two', 'is': 'three', 'btechgeeks': 'four'}
The given second dictionary =  {'good': 'five', 'morning': 'six', 'btechgeeks': 'four', 'is': 'three'}
printing the intersection of the given two dictionaries =  {'is': 'three', 'btechgeeks': 'four'}

Method #2: Using & Operator

Approach:

• Give the two dictionaries as static input and store them in two variables.
• Then, using the items() function, convert the dictionaries dictionary1 and dictionary2 into list format. Then, using the & operator, perform their AND operation. The common key-value pairs are then converted into a dictionary and stored in intersectdicts using dict().
• Print the new dictionary intersectdicts with the common keys and their values.
• The Exit of the Program.

Below is the implementation:

# Give the two dictionaries as static input and store them in two variables.
dictionary1 = {'Hello': 'one', 'this': 'two',
               'is': 'three', 'btechgeeks': 'four'}
dictionary2 = {'good': 'five', 'morning': 'six',
               'btechgeeks': 'four', 'is': 'three'}

# printing the original given two dictionaries
print("The given first dictionary = ", dictionary1)
print("The given second dictionary = ", dictionary2)
# Then, using the items() function,
# convert the dictionaries dictionary1 and dictionary2 into list format.
# Then, using the & operator, perform their AND operation.
# The common key-value pairs are then
# converted into a dictionary and stored in intersectdicts using dict().
intersectdicts = dict(dictionary1.items() & dictionary2.items())

# Print the new dictionary intersectdicts with the common keys and their values.
print("printing the intersection of the given two dictionaries = ", (intersectdicts))

Output:

The given first dictionary =  {'Hello': 'one', 'this': 'two', 'is': 'three', 'btechgeeks': 'four'}
The given second dictionary =  {'good': 'five', 'morning': 'six', 'btechgeeks': 'four', 'is': 'three'}
printing the intersection of the given two dictionaries =  {'is': 'three', 'btechgeeks': 'four'}

Related Programs:

• python how to create a list of all the keys in the dictionary
• program for addition of two matrices in python cpp
• python program to find the minimum difference between the index of two given elements present in an array
• dictionaries in python
• how to create and initialize a list of lists in python
• python how to find all indexes of an item in a list
• basics of python built in types

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Dictionaries in Python:

In Python, a dictionary dict is a one-to-one mapping; it includes a set of (key, value) pairs, with each key mapped to a value. It exemplifies a hash map or hash table (from Computer Science).

Each key denotes a value and is separated by a colon (:).

Curly brackets are used to define a dictionary. The value to the left of the colon is known as the key, while the value to the right of the colon is known as the value. A comma separates each (key, value) pair.

Examples:

Example1:

Input:

given number = 17

Output:

Enter some random number = 17
printing the resultant dictionary :
key = 1 value = 1
key = 2 value = 4
key = 3 value = 9
key = 4 value = 16
key = 5 value = 25
key = 6 value = 36
key = 7 value = 49
key = 8 value = 64
key = 9 value = 81
key = 10 value = 100
key = 11 value = 121
key = 12 value = 144
key = 13 value = 169
key = 14 value = 196
key = 15 value = 225
key = 16 value = 256
key = 17 value = 289

Example2:

Input:

given number=11

Output:

printing the resultant dictionary :
key = 1 value = 1
key = 2 value = 4
key = 3 value = 9
key = 4 value = 16
key = 5 value = 25
key = 6 value = 36
key = 7 value = 49
key = 8 value = 64
key = 9 value = 81
key = 10 value = 100
key = 11 value = 121

Program to Generate a Dictionary that Contains Numbers (between 1 and n) in the Form (x, x*x) in Python

There are several ways to generate a dictionary which contains numbers from 1 to n in the form ( x, x*x ) some of them are:

• Using Dictionary Comprehension (User Input)
• Using Dictionary Comprehension (Static Input)
• Using for loop (Static Input)

Method #1: Using Dictionary Comprehension (User Input)

Approach:

• Scan the number and store it in a variable
• Create a dictionary and use dictionary comprehension to populate it with values that have a number between 1 and given number as the key and the square of the number as their values.
• Print the resultant dictionary
• Exit of program

Below is the implementation:

# given number
numb = int(input("Enter some random number = "))
# using dictionary comprehension
resultdict = {k: k*k for k in range(1, numb+1)}
# printing the resultant dictionary
print('printing the resultant dictionary :')
for key,value in resultdict.items():
    print("key =",key,"value =",value)

Output:

Enter some random number = 17
printing the resultant dictionary :
key = 1 value = 1
key = 2 value = 4
key = 3 value = 9
key = 4 value = 16
key = 5 value = 25
key = 6 value = 36
key = 7 value = 49
key = 8 value = 64
key = 9 value = 81
key = 10 value = 100
key = 11 value = 121
key = 12 value = 144
key = 13 value = 169
key = 14 value = 196
key = 15 value = 225
key = 16 value = 256
key = 17 value = 289

Explanation:

• A number must be entered by the user and saved in a variable.
• Using dictionary comprehension, a dictionary is declared and initialized with values.
• The digits 1 to n are preserved as keys, while the squares of the numbers are used as values.
• The final resultant dictionary is printed

Method #2: Using Dictionary Comprehension (Static Input)

Approach:

• Give the number as static input.
• Create a dictionary and use dictionary comprehension to populate it with values that have a number between 1 and given number as the key and the square of the number as their values.
• Print the resultant dictionary
• Exit of program

Below is the implementation:

# give the number as static
numb = 11
# using dictionary comprehension
resultdict = {k: k*k for k in range(1, numb+1)}
# printing the resultant dictionary
print('printing the resultant dictionary :')
for key, value in resultdict.items():
    print("key =", key, "value =", value)

Output:

printing the resultant dictionary :
key = 1 value = 1
key = 2 value = 4
key = 3 value = 9
key = 4 value = 16
key = 5 value = 25
key = 6 value = 36
key = 7 value = 49
key = 8 value = 64
key = 9 value = 81
key = 10 value = 100
key = 11 value = 121

Method #3:Using for loop (Static Input)

Approach:

• Give the number as static input.
• Take a empty dictionary
• Traverse from 1 to given number using for loop.
• For each iterator value initialize the key p with the value p*p where p is iterator value.
• Print the resultant dictionary
• Exit of program

Below is the implementation:

# give the number as static
numb = 13
# Take a empty dictionary
resultdict = {}
# using for to iterate from 1 to numb
for p in range(1, numb+1):
    resultdict[p] = p*p
# printing the resultant dictionary
print('printing the resultant dictionary :')
for key, value in resultdict.items():
    print("key =", key, "value =", value)

Output:

printing the resultant dictionary :
key = 1 value = 1
key = 2 value = 4
key = 3 value = 9
key = 4 value = 16
key = 5 value = 25
key = 6 value = 36
key = 7 value = 49
key = 8 value = 64
key = 9 value = 81
key = 10 value = 100
key = 11 value = 121
key = 12 value = 144
key = 13 value = 169

Explanation :

Here we assigned square of iterator value to the key  of the dictionary instead of using dictionary comprehension

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Files in Python:

A file is a piece of information or data that is kept in computer storage devices. You are already familiar with several types of files, such as music files, video files, and text files. Python makes it simple to manipulate these files. In general, files are classified into two types: text files and binary files. Text files are plain text, whereas binary files include binary data that can only be read by a computer.

Python file handling (also known as File I/O) is an important topic for programmers and automation testers. It is necessary to work with files to either write to or read data from them.

Furthermore, if you are not already aware, I/O operations are the most expensive procedures through which a program might fail. As a result, you should take caution while implementing file handling for reporting or any other reason. Optimizing a single file activity can contribute to the development of a high-performance application or a solid solution for automated software testing.

Given a file and a character, the task is to count the frequency of the given character in the given file.

Program that Reads a Text File and Counts the Number of Times a Certain Letter Appears in the Text File in Python

Below is the full approach to read a text file and count the number of times the given character appears in the given text file.

Approach:

• Take a variable say charcount, that stores the count of the given character and initialize it to 0.
• Scan the given character using the input() function and store it in a variable.
• Create the file or upload the existing file.
• Enter the file name of the file using the input() function and store it in a variable.
• In read mode, open the file with the entered file name.
• Using for loop, go over the lines in the file.
• Split the line into words using the split() function.
• To traverse the words in the list, use a for loop, then another for loop to traverse the letters in the word.
• If the character given by the user and the character encountered during an iteration are equal, increment the charcount by 1.
• Print the charcount.
• The exit of the program.

Below is the implementation:

# Take a variable say charcount, that stores the count of the given character and initialize it to 0.
charcount = 0
# Scan the given character using the input() function and store it in a variable. 
givenchar = input('Enter some random character = ')
# Enter the file name of the  file using the input() function and store it in a variable.
filename = input("Enter the file name = ")
# In read mode, open the file with the entered file name.
with open(filename, 'r') as givenfile:
  # Using for loop, go over the lines in the first file.
    for fileline in givenfile:
        # Split the line into words using the split() function.
        wordslist = fileline.split()
        # To traverse the words in the list, use a for loop, then another
        # for loop to traverse the letters in the word.
        for word in wordslist:
            for character in word:
                # If the character given by the user and the character encountered
                # during an iteration are equal, increment the charcount by 1.
                if(character == givenchar):
                    charcount = charcount+1
print('The count of the character {', givenchar, '} =', charcount)

Input File:

Guido van Rossum created Python, an interpreted, object-oriented, high-level programming language with dynamic semantics.
It was first published in 1991. The name "Python" is a tribute to the British comedy troupe Monty Python and is meant to
be simple as well as entertaining. Python has a reputation for being a beginner-friendly language, and it has surpassed 
Java as the most generally used beginning language because it takes care of much of the complexity for the user, allowing
beginners to concentrate on mastering programming ideas rather than minute details.
Python is popular for Rapid Application Development and as a scripting or glue language to tie existing components 
together because of its high-level, built-in data structures, dynamic typing, and dynamic binding. It is also used for
server-side web development, software development, mathematics, and system scripting. Python's programme maintenance
costs are lower because of its simple syntax and emphasis on readability. Modular applications and code reuse are further
made easier with Python's support for modules and packages.
Python is an open source community language, which means that libraries and features are constantly being developed by 
individual programmers.

Output:

Enter some random character = s
Enter the first file name = hello.txt
The count of the character { s } = 70

Explanation:

• A file name and the letter to be searched must be entered by the user.
• In read mode, the file is opened with the open() method.
• To read through each line of the file, a for loop is utilized.
• Using split, each line is divided into a list of terms ().
• A for loop is used to go through the list of words, and another for loop is used to go through the letters of the word.
• If the letter provided and the letter found during the iteration is the same, the letter count is increased.
• The total number of times the letter appears is printed.

Google Colab Images:

Files and Code:

Code:

Output Image:

Hello.txt:

We calculated the count of the character ‘s’ from this file.
Related Programs:

• Python Program to Read a File and Capitalize the First Letter of Every Word in the File
• Python Program to Append the Contents of One File to Another File
• Python Program to Read a Text File and Print all the Numbers Present in the Text File
• Python Program to Copy the Contents of One File into Another
• Python Program to Count the Number of Words in a Text File
• Python Program to Count the Number of Lines in a Text File
• Python Program to Count the Number of Blank Spaces in a Text File
• Python Program to Count the Occurrences of a Word in a Text File

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Dictionaries in Python: In Python, a dictionary dict is a one-to-one mapping; it includes a set of (key, value) pairs, with each key mapped to a value. It exemplifies a hash map or hash table (from Computer Science). Each key denotes a value and is separated by a colon (:).

Curly brackets are used to define a dictionary. The value to the left of the colon is known as the key, while the value to the right of the colon is known as the value. A comma separates each (key, value) pair.

• Python Programming Examples on How to Map Two Lists into a Dictionary
• Python Program to Map Two Lists into a Dictionary
• Write a Python Program to Map Two Lists into a Dictionary?
• How to Combine Two Lists into a Dictionary Python?
• Python Program to Map Two lists into a Dictionary using Dictionary Comprehension
• How to Combine Two List and Convert into Dictionary using For Loop?

Python Programming Examples on How to Map Two Lists into a Dictionary

Example 1:

Input:

Enter number of elements to be added to the dictionary = 8
Enter the keys : 
Enter the key1 = hello
Enter the key2 = this
Enter the key3 = is
Enter the key4 = btechgeeks
Enter the key5 = online
Enter the key6 = coding
Enter the key7 = python
Enter the key8 = platform
Enter the Values : 
Enter the value1 = 45
Enter the value2 = 82
Enter the value3 = 125
Enter the value4 = 962
Enter the value5 = 712
Enter the value6 = 100
Enter the value7 = 852
Enter the value8 = 965

Output:

The resultant dictionary with keys = ['hello', 'this', 'is', 'btechgeeks', 'online', 'coding', 'python', 'platform'] 
values = [45, 82, 125, 962, 712, 100, 852, 965] :
{'hello': 45, 'this': 82, 'is': 125, 'btechgeeks': 962, 'online': 712, 'coding': 100, 'python': 852, 'platform': 965}

Example 2:

Input:

Enter number of elements to be added to the dictionary = 5
Enter the keys : 
Enter the key1 = good
Enter the key2 = morning
Enter the key3 = python
Enter the key4 = script
Enter the key5 = code
Enter the Values : 
Enter the value1 = 745
Enter the value2 = 123
Enter the value3 = 985
Enter the value4 = 100
Enter the value5 = 585

Output:

The resultant dictionary with keys = ['good', 'morning', 'python', 'script', 'code'] 
values = [745, 123, 985, 100, 585] :
{'good': 745, 'morning': 123, 'python': 985, 'script': 100, 'code': 585}

Python Program to Map Two Lists into a Dictionary

Mapping Two Lists into a Dictionary using zip() ,append() Functions

Approach:

1. Declare two empty lists one to store keys and the other to store values.
2. Consider using a for loop to accept values for both lists.
3. Scan the number of elements to be added to the dictionary and store it in a variable.
4. Scan the values into the list and insert them into the list using another for loop.
5. Repeat steps 4 and 5 for the values list as well.
6. Zip the two lists together and use dict() to turn them into a dictionary.
7. Print the dictionary.
8. Exit of program.

Write a Python Program to Map Two Lists into a Dictionary?

# Declare two empty lists one to store keys and the other to store values.
keyslist = []
valueslist = []
# Scan the number of elements to be added to the dictionary and store it in a variable.
numb = int(input("Enter number of elements to be added to the dictionary = "))
print("Enter the keys : ")
for p in range(numb):
  # scanning the keys
    keyelement = input("Enter the key"+str(p+1)+" = ")
    keyslist.append(keyelement)
print("Enter the Values : ")
for p in range(numb):
    # scanning the values
    valueelement = int(input("Enter the value"+str(p+1)+" = "))
    valueslist.append(valueelement)
# Zip the two lists together and use dict() to turn them into a dictionary.
resultdict = dict(zip(keyslist, valueslist))
# printing the dictionary
print("The resultant dictionary with keys =",
      keyslist, "values =", valueslist, ":")
print(resultdict)

Output:

Enter number of elements to be added to the dictionary = 8
Enter the keys : 
Enter the key1 = hello
Enter the key2 = this
Enter the key3 = is
Enter the key4 = btechgeeks
Enter the key5 = online
Enter the key6 = coding
Enter the key7 = python
Enter the key8 = platform
Enter the Values : 
Enter the value1 = 45
Enter the value2 = 82
Enter the value3 = 125
Enter the value4 = 962
Enter the value5 = 712
Enter the value6 = 100
Enter the value7 = 852
Enter the value8 = 965
The resultant dictionary with keys = ['hello', 'this', 'is', 'btechgeeks', 'online', 'coding', 'python', 'platform'] values = [45, 82, 125, 962, 712, 100, 852, 965] :
{'hello': 45, 'this': 82, 'is': 125, 'btechgeeks': 962, 'online': 712, 'coding': 100, 'python': 852, 'platform': 965}

How to Combine Two Lists into a Dictionary Python?

• The number of elements in the list must be entered by the user and saved in a variable.
• The user must assign values to the equal number of entries in the list.
• The append function takes each element from the user and appends it to the end of the list as many times as the number of elements taken is.
• The identical steps as in 2 and 3 are taken for the second value list.
• The zip() function is used to combine the two lists.
• Using dict, the zipped lists are then combined to make a dictionary ().
• The dictionary created by combining the two lists is then printed.

Python Program to Map Two lists into a Dictionary using Dictionary Comprehension

Dictionary Comprehension is a technique used to create a dictionary in Python. In this process, we will combine two sets of data either in lists or arrays. It is a simple approach for creating dictionaries and uses pointed brackets({}).

items = ['book', 'pen', 'paper']
quantities = [5, 10, 25]
items_dict = {key:value for key, value in zip(items, quantities)}

print(items_dict)

Output:

{'book': 5, 'pen': 10, 'paper': 25}

How to Combine Two List and Convert into Dictionary using For Loop?

fruits = ['Orange', 'Pomegranate', 'Banana','Guava']
price = [80, 70, 112, 66]

fruits_price = zip(fruits, price)

# create dictionary
fruits_dict = {}

for key, value in fruits_price:
if key in fruits_dict:
# handling duplicate keys
pass
else:
fruits_dict[key] = value

print(fruits_dict)

Output:

{'Orange': 80, 'Pomegranate': 70, 'Banana': 112, 'Guava': 66}

Related Programs:

• • Python Program to Count the Frequency of Words Appearing in a String Using a Dictionary
  • Python Program to Iterate Through Two Lists in Parallel
  • Python Program to Generate a Dictionary that Contains Numbers (between 1 and n) in the Form (x, x*x).
  • Python Program to Add a Key, Value Pair to the Dictionary
  • Python Program to Sum All the Items in a Dictionary

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Files in Python:

Python, like many other programming languages, offers file handling and allows users to read and write files, as well as perform a variety of other file-related tasks. The concept of file handling has been extended to a variety of other languages, but the implementation is either complicated or lengthy. However, like most Python principles, this concept is simple and straightforward. Python processes file differently depending on whether they are text or binary, which is crucial. Each line of code consists of a series of characters that together constitute a text file. A specific character called the EOL or End of Line character, such as the comma, or a newline character is used to end each line in a file.

Given a file, the task is to read the given text file and print all the numbers present in the given text file.

Program to Read a Text File and Print all the Numbers Present in the Text File

Below is the full process to read a text file and print all the numbers present in the given text file.

Approach:

• Create the sample file or upload the existing file.
• In read mode, open the first file say  samplefile.txt.
• Using for loop, go over the lines in the sample file.
• Split the line into words using the split() function.
• Traverse through the words using for loop.
• Traverse through all the characters of the word using another For loop.
• Check to see if the letter is a digit, and if so, print it.
• Exit of program

Below is the implementation:

filename = input('Enter the name of the given file : ')
# In read mode, open the given file with the name 'filename'
with open(filename, 'r') as file:
  # Using for loop, go over the lines in the sample file.
    for line in file:
      # Split the line into words using the split() function.
        words = line.split()
        # Traverse through the words using for loop.
        for i in words:
          # Traverse through all the characters of the word using another for loop.
            for letter in i:
              # Check to see if the letter is a digit, and if so, print it.
                if(letter.isdigit()):
                    print(letter)

Output:

Enter the name of the given file : samplefile.txt 
 1
 1
 2
 3
 9
 4
 5
 6
 7
 9
 8
 3
 3

Explanation:

• A file name must be entered by the user.
• In read mode, the file is opened with the open() method.
• To read each line in the file, a for loop is utilized.
• Using split, each line is divided into a list of words ().
• The word list is traversed using a for loop, and the letters of the word are traversed using another For loop.
• The digit is printed if the letter encountered is a digit.
• Here it prints all the digits present in the given file separately in a newline.

Sample file.txt :

hel11l2o th3is i9s B4TechGe5eks Onl6ine Cod7ing Platf9orm fo8r Bt3ech Stude3nts

Google Colab Images:

File and Code:

Output Image:

File Content:

Related Programs:

• Python Program to Read a File and Capitalize the First Letter of Every Word in the File
• Python Program to Append the Contents of One File to Another File
• Python Program to Read a Text File and Print all the Numbers Present in the Text File
• Python Program to Copy the Contents of One File into Another
• Python Program to Count the Number of Words in a Text File
• Python Program to Count the Number of Lines in a Text File
• Python Program to Count the Number of Blank Spaces in a Text File
• Python Program to Count the Occurrences of a Word in a Text File

Are you new to the java programming language? We recommend you to ace up your practice session with these Basic Java Programs Examples

Files in Python:

Python, like many other programming languages, offers file handling and allows users to read and write files, as well as perform a variety of other file-related tasks. The concept of file handling has been extended to a variety of other languages, but the implementation is either complicated or lengthy. However, like most Python principles, this concept is simple and straightforward. Python processes file differently depending on whether they are text or binary, which is crucial. Each line of code consists of a series of characters that together constitute a text file. A specific character called the EOL or End of Line character, such as the comma, or a newline character is used to end each line in a file.

Given two files, the task is to copy the contents of one file to the other file.

Program to Copy the Contents of One File into Another

Below is the full process to copy the contents of one file to another file.

Approach:

• Create the first file or upload the existing file.
• Create the second file or upload the existing file.
• In read mode, open the first file say  samplefile1.txt.
• In write mode, open the second file say  samplefile2.txt.
• Using for loop, go over the lines in the first file.
• Copy the ith line of the first file to the second file using the write function.
• All the content from the first file will be copied to the second file.
• The exit of the program.

Below is the implementation:

# In read mode, open the first file say  samplefile1.txt.
with open("samplefile1.txt") as file1:
  # In write mode, open the second file say  samplefile2.txt.
    with open("samplefile2.txt", "w") as file2:
      # Using for loop, go over the lines in the first file.
        for iline in file1:
          # Copy the ith line of the first file to the second file using the write function.
            file2.write(iline)

Explanation:

• The f stream is used to open the file samplefile1.txt with the open() function.
• Another file, samplefile2.txt, is opened in write mode using the f1 stream using the open() function.
• A for loop is used to iterate over each line in the file (in the input stream).
• The output file contains each of the iterated lines.

Output:

Before Copying:

Samplefile1.txt

Do you Love to Program in Python Language? Are you completely new to 
the Python programming language? Then, refer to this ultimate guide on
Python Programming and become the top programmer. For detailed information
such as What is Python? Why we use it? Tips to Learn Python Programming Language,
Applications for Python dive into this article.

Samplefile2.txt

This is BtechGeeks

After Copying:

Samplefile1.txt

Do you Love to Program in Python Language? Are you completely new to 
the Python programming language? Then, refer to this ultimate guide on
Python Programming and become the top programmer. For detailed information
such as What is Python? Why we use it? Tips to Learn Python Programming Language,
Applications for Python dive into this article.

Samplefile2.txt

Do you Love to Program in Python Language? Are you completely new to 
the Python programming language? Then, refer to this ultimate guide on
Python Programming and become the top programmer. For detailed information
such as What is Python? Why we use it? Tips to Learn Python Programming Language,
Applications for Python dive into this article.

Google Colab Images:

Files and Code:

Samplefile2.txt:

Samplefile1.txt:

Related Programs:

• Python Program to Read a File and Capitalize the First Letter of Every Word in the File
• Python Program to Append the Contents of One File to Another File
• Python Program to Read a Text File and Print all the Numbers Present in the Text File
• Python Program to Copy the Contents of One File into Another
• Python Program to Count the Number of Words in a Text File

Practice Java programming from home without using any fancy software just by tapping on this Simple Java Programs for Beginners tutorial.

This tutorial will show you how to use Python to count the number of words in a file. One Python program will be written to count the total number of words in a text file. The path to the file will be passed to the application as an input. This tutorial will teach you how to open a file and read its contents in Python. You’ll also learn how to get a list of all the words in a string.

Python provides a wide range of useful techniques for working with files. We don’t require any additional modules to work on any file. Using these methods, you may quickly read from a file, write to a file, or even append any content to a file.

Program to Count the Number of Words in a Text File

• Algorithm
• Implementation
• Explanation:

1)Algorithm

• Make a single variable to hold the file path. This is a fixed variable. In the example below, you must replace this value with the file path from your own system. In addition, one more variable should be set to hold the overall number of words. Set the value of this variable to zero.
• In read-only mode, open the file. In this example, we are merely reading the file’s content. Read mode will enough for counting the number of words in the file.
• Using a loop, iterate through each line of the file. We can iterate through the lines one by one because this is a text file.
• Split the line into words within the loop. Determine the total number of words and add them to the variable that holds the total number of words. Add the count of each line to this variable on each loop iteration.
• When the loop is finished, the word count variable will have the total number of words in the text file. This variable’s value will be printed to the user.

2)Implementation

Below is the implementation:

# taking a variable which stores count and initializing it to 0
word_count = 0
# given file name
given_filename = "wordsfile.txt"
# opening the file in reading mode
with open(given_filename, 'r') as givenfile:
    # traversing the lines of file using for loop
    for fileline in givenfile:
      # split the line into words using split() function.
      # increasing the word count by counting the number of words in the file
        word_count += len(fileline.split())

print("The total number of files present in the given file = ", word_count)

Output:

The total number of files present in the given file = 103

3)Explanation:

• The steps outlined in the algorithm above are used to implement the program. The variable ‘word count’ is used to store the total number of words in the text file. This variable’s value is set to zero at the start. If a word is found, we shall add one to this variable.
• The variable ‘file name’ is used to store the file path. Change the value of this variable to your own file location.
• You can find the path of a file by dragging and dropping it onto the terminal. If you do not modify this variable value, the program will not run.
• We’re going to open the file in reading mode. To open a file, use the open() method. The method’s first parameter is the file’s path, and its second parameter is the mode for opening the file. We’re using the character ‘r’ to indicate read-mode when we open the file.
• We are iterating through the lines of the file using a single ‘for loop.’
• The split() method is used within the loop to separate the line. This method returns a single list containing the string’s words. The length of this list is the number of words in that line. The len() method is used to calculate the word count. This value is being added to the variable word count.
• The word count variable holds the overall word count in the file at the end of the program. Display its value to the user.

Sample Implementation in google colab:

Our website provided core java programs examples with output aid beginners and expert coders to test their knowledge gap and learn accordingly.

Files in Python:

A file is a piece of information or data that is kept in computer storage devices. You are already familiar with several types of files, such as music files, video files, and text files. Python makes it simple to manipulate these files. In general, files are classified into two types: text files and binary files. Text files are plain text, whereas binary files include binary data that can only be read by a computer.

Python file handling (also known as File I/O) is an important topic for programmers and automation testers. It is necessary to work with files to either write to or read data from them.

Furthermore, if you are not already aware, I/O operations are the most expensive procedures through which a program might fail. As a result, you should take caution while implementing file handling for reporting or any other reason. Optimizing a single file activity can contribute to the development of a high-performance application or a solid solution for automated software testing.

Given a string and file, the task is to append this string to the given file.

Program to Read a String from the User and Append it into a File

Below is the full process Read a string from the user and append it to the file.

Approach:

• Give the string as static input and store it in a variable.
• Give the file name as user input and store it in a variable.
• Open the file with the given file name in append mode.
• Write a new line character to the given file using the write() function and ‘\n’.
• Append the given string to the given file using the write() function.
• Close the given file using close() function.
• To print the contents of the given file after appending the string we open the file again in read mode.
• Print the contents of the given file using for loop
• The exit of the program.

Below is the implementation:

#Give the string as static input and store it in a variable.
givenstring=input('Enter some random string = ')
#Enter the file name of the  file using the input() function and store it in a variable.
filename = input("Enter the first file name = ")
#In append mode, open the first file with the entered file name.
givenfile=open(filename,"a")
#Write a new line character to the given file using the write() function and '\n'.
givenfile.write("\n")
#Append the given string to the given file using the write() function.
givenfile.write(givenstring)
#Close the given file using close() function.
givenfile.close()
print('Printing the contents of the given file :')
with open(filename, 'r') as givenfile:
  #Using for loop, go over the lines in the first file.
    for fileline in givenfile:
      #print the lines
        print(fileline)

Output:

Enter some random string = btechgeeks
Enter the first file name = samplefile2.txt
Printing the contents of the given file :
hello this is

btechgeeks

Explanation:

• A file name must be entered by the user.
• The file is opened in append mode with the open() function.
• The user’s string is retrieved, appended to the existing file, and the file is closed.
• The file is opened in read mode once more.
• We printed the contents of the given file using For loop by traversing through the lines.

Google Colab Images:

Files and Code:

Code:

Output:

Samplefile2.txt

Related Programs:

• Python Program to Read a File and Capitalize the First Letter of Every Word in the File
• Python Program to Append the Contents of One File to Another File
• Python Program to Read a Text File and Print all the Numbers Present in the Text File
• Python Program to Copy the Contents of One File into Another
• Python Program to Count the Number of Words in a Text File