Python Program to Check if a String is a Pangram or Not

Strings in Python:

A Python string is an ordered collection of characters used to express and store text-based data. Strings are saved in an adjacent memory area as individual characters. It is accessible in both directions: forward and backward. Characters are merely symbols. Strings are immutable Data Types in Python, which means they cannot be modified once they are formed.

Pangram:

If a sentence or string contains all 26 letters of the English alphabet at least once, it is considered to be a pangram.

Examples:

Example1:

Input:

given string ="Helloabcdfegjilknmporqstvuxwzy"

Output:

The given string helloabcdfegjilknmporqstvuxwzy is a pangram

Example2:

Input:

given string ="hellothisisbtechgeeks"

Output:

The given string hellothisisbtechgeeks is not a pangram

Python Program to Check if a String is a Pangram or Not

There are several ways to check if the given string is pangram or not some of them are:

Naive Approach
Using set() method
Using Counter() function (Hashing)

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Method #1:Naive Approach

Approach:

Scan the given string or provide static input.
Use the lower() method to convert this string to lowercase.
The brute force method is to take a string that contains all of the letters of the English alphabet.
Traverse through all of the alphabet’s characters string
Check to see if this character appears in the given string.
If it isn’t present, return False.
Return True at the end of the loop (which implies it is pangram)

Below is the implementation:

# Python Program to Check if a String is a Pangram or Not
def checkPangramString(string):

    # creating a new string (alphabet string which stores all the alphabets of the english language
    AlphabetString = 'abcdefghijklmnopqrstuvwxyz'

    # Traverse through the alphabets string
    for char in AlphabetString:
        # Check if this character is present in given string .
        if char not in string.lower():
            # if yes then this character is not available hence return False
            return False
    # After the end of loop return True (which implies it is pangram)
    return True


# given string
string = "Helloabcdfegjilknmporqstvuxwzy"
# converting the given string into lower case
string = string.lower()
# passing this string to checkPangramString function which returns true
# if the given string is pangram else it will return false

if checkPangramString(string):
    print("The given string", string, "is a pangram")
else:
    print("The given string", string, "is not a pangram")

Output:

The given string helloabcdfegjilknmporqstvuxwzy is a pangram

Method #2:Using set() method

The following program can be easily implemented in Python by using the set() method.

Approach:

Scan the given string or provide static input.
Use the lower() method to convert this string to lowercase.
Use the set() function to convert this string to a set.
Determine the length of the set.
If the length is 26, it is a pangram (since the English language has only 26 alphabets).
Otherwise, it is not a pangram.

Below is the implementation:

# Python Program to Check if a String is a Pangram or Not
def checkPangramString(string):

    # converting given string to set using set() function
    setString = set(string)
    # calculate the length of the set
    length = len(setString)
    # If the length is 26, it is a pangram so return true
    if(length == 26):
        return True
    else:
        return False


# given string
string = "Helloabcdfegjilknmporqstvuxwzy"
# converting the given string into lower case
string = string.lower()
# passing this string to checkPangramString function which returns true
# if the given string is pangram else it will return false

if checkPangramString(string):
    print("The given string", string, "is a pangram")
else:
    print("The given string", string, "is not a pangram")

Output:

The given string helloabcdfegjilknmporqstvuxwzy is a pangram

Note:

This method is only applicable if the given string contains alphabets.

Method #3:Using Counter() function (Hashing)

The following program can be easily implemented in Python by using the counter() function

Approach:

Scan the given string or provide static input.
Use the lower() method to convert this string to lowercase.
Calculate the frequency of all characters in the given string using Counter() method
Calculate the length of the Counter dictionary.
If the length is 26, it is a pangram (since the English language has only 26 alphabets).
Otherwise, it is not a pangram.

Below is the implementation:

# Python Program to Check if a String is a Pangram or Not
# importing counter from collections
from collections import Counter


def checkPangramString(string):

    # Calculate the frequency of all characters in the given string
    # using Counter() method
    frequ = Counter(string)
    # calculate the length of the frequency dictionary which is
    # returned from counter() function
    length = len(frequ)
    # If the length is 26, it is a pangram so return true
    if(length == 26):
        return True
    else:
        return False


# given string
string = "Helloabcdfegjilknmporqstvuxwzy"
# converting the given string into lower case
string = string.lower()
# passing this string to checkPangramString function which returns true
# if the given string is pangram else it will return false

if checkPangramString(string):
    print("The given string", string, "is a pangram")
else:
    print("The given string", string, "is not a pangram")

Output:

The given string helloabcdfegjilknmporqstvuxwzy is a pangram

Note:

This method is only applicable if the given string contains alphabets.

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