Python Program for Dictionary keys() Function

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In the previous article, we have discussed Python Program for Set pop() Method
Dictionary in python :

A dictionary is a set of elements that have key-value pairs. The values in the elements are accessed using the element’s keys.

Examples:

Example1:

Input:

Given dictionary = {'hello': 120, 'this': 130, 'is': 140, 'btechgeeks': 150}

Output:

The above given dictionary is :
{'hello': 120, 'this': 130, 'is': 140, 'btechgeeks': 150}
The above given dictionary keys are :
dict_keys(['hello', 'this', 'is', 'btechgeeks'])
The above given new dictionary is :
{}
The above given New empty dictionary keys are :
dict_keys([])

Example2:

Input:

Given dictionary = {10: 'good', 20: 'morning', 30: 'btechgeeks'}

Output:

The above given dictionary is :
{10: 'good', 20: 'morning', 30: 'btechgeeks'}
The above given dictionary keys are :
dict_keys([10, 20, 30])
The above given new dictionary is :
{}
The above given New empty dictionary keys are :
dict_keys([])

Program for Dictionary keys() Function in Python

Dictionary keys() Function:

In python, the dictionary keys() function returns a list of available keys in a dictionary (total keys present).

Syntax:

dictionary.keys()

Parameter Values: The dictionary keys() function doesn’t have any parameters.

Method #1: Using Built-in Functions (Static Input)

Approach:

  • Give the dictionary as static input by initializing it with some random values and store it in a variable.
  • Print the above-given dictionary.
  • Apply dictionary. keys() method to the above-given dictionary to get all the keys.
  • Store it in another variable.
  • Print the above-given dictionary keys.
  • Take a new empty dictionary and store it in another variable.
  • Print the above-initialized new empty dictionary.
  • Apply dictionary. keys() method to the above new empty dictionary and print it.
  • The Exit of Program.

Below is the implementation:

# Give the dictionary by initializing it with some random values and store it
# in a variable.
gvn_dictinry = {'hello': 120, 'this': 130, 'is': 140, 'btechgeeks': 150}
# Print the above-given dictionary.
print("The above given dictionary is :")
print(gvn_dictinry)
# Apply dictionary.keys() method to the above-given dictionary to get all the keys.
# Store it in another variable
dict_keyss = gvn_dictinry.keys()
# Print the above given dictionary keys.
print("The above given dictionary keys are :")
print(dict_keyss)
# Take a new empty dictionary and store it in another variable.
new_dict = {}
# Print the above-initialized new empty dictionary.
print("The above given new dictionary is :")
print(new_dict)
# Apply dictionary.keys() method to the above new empty dictionary and print it.
print("The above given New empty dictionary keys are :")
print(new_dict.keys())

Output:

The above given dictionary is :
{'hello': 120, 'this': 130, 'is': 140, 'btechgeeks': 150}
The above given dictionary keys are :
dict_keys(['hello', 'this', 'is', 'btechgeeks'])
The above given new dictionary is :
{}
The above given New empty dictionary keys are :
dict_keys([])

Method #2: Using Built-in Functions (User Input)

Approach:

  • Take a dictionary and initialize it with an empty dictionary using dict() or {}.
  • Give the number of keys as user input using int(input()) and store it in a variable.
  • Loop till the given number of keys using for loop.
  • Inside the for loop scan the key and value as user input using input(), split() functions, and store them in two separate variables.
  • Initialize the key with the value of the dictionary.
  • Print the above-given dictionary.
  • Apply dictionary. keys() method to the above-given dictionary to get all the keys.
  • Store it in another variable.
  • Print the above-given dictionary keys.
  • Take a new empty dictionary and store it in another variable.
  • Print the above-initialized new empty dictionary.
  • Apply dictionary. keys() method to the above new empty dictionary and print it.
  • The Exit of Program.

Below is the implementation:

# Take a dictionary and initialize it with an empty dictionary using dict() or {}.
gvn_dictinry = {}
# Give the number of keys as user input using int(input()) and store it in a variable.
numb_of_kys = int(
    input('Enter some random number of keys of the dictionary = '))
# Loop till the given number of keys using for loop.
for p in range(numb_of_kys):
        # Inside the for loop scan the key and value as
    # user input using input(),split() functions
    # and store them in two separate variables.
    keyy, valuee =  input(
        'Enter key and value separated by spaces = ').split()
    # Initialize the key with the value of the dictionary.
    gvn_dictinry[keyy] = valuee

# Print the above-given dictionary.
print("The above given dictionary is :")
print(gvn_dictinry)
# Apply dictionary.keys() method to the above-given dictionary to get all the keys.
# Store it in another variable
dict_keyss = gvn_dictinry.keys()
# Print the above given dictionary keys.
print("The above given dictionary keys are :")
print(dict_keyss)
# Take a new empty dictionary and store it in another variable.
new_dict = {}
# Print the above-initialized new empty dictionary.
print("The above given new dictionary is :")
print(new_dict)
# Apply dictionary.keys() method to the above new empty dictionary and print it.
print("The above given New empty dictionary keys are :")
print(new_dict.keys())

Output:

Enter some random number of keys of the dictionary = 3
Enter key and value separated by spaces = 10 good
Enter key and value separated by spaces = 20 morning
Enter key and value separated by spaces = 30 btechgeeks
The above given dictionary is :
{'10': 'good', '20': 'morning', '30': 'btechgeeks'}
The above given dictionary keys are :
dict_keys(['10', '20', '30'])
The above given new dictionary is :
{}
The above given New empty dictionary keys are :
dict_keys([])

Want to excel in creating, adding, removing elements from python dictionaries? Look at this tutorial ie., python dictionary method examples, and explore more.