# Python Program for Dictionary clear() Function

In the previous article, we have discussed Python Program for Area of a Polygon with Given n Ordered Vertices
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': 100, 'this': 200, 'is': 300, 'btechgeeks': 400}

Output:

The given dictionary before clearing is :
{'hello': 100, 'this': 200, 'is': 300, 'btechgeeks': 400}
The length of the given dictionary before clearing =  4
The given dictionary After clearing is :
{}
The length of the given dictionary After clearing =  0

Example2:

Input:

Given dictionary = {'good': '1', 'morning': '2', 'this': '3', 'is': '4', 'btechgeeks': '5'}

Output:

The given dictionary before clearing is :
{'good': '1', 'morning': '2', 'this': '3', 'is': '4', 'btechgeeks': '5'}
The length of the given dictionary before clearing = 5
The given dictionary After clearing is :
{}
The length of the given dictionary After clearing = 0

## Program for Dictionary clear() Function in Python

Dictionary clear() Function:

clear() is a Python dictionary method that removes all items from the dictionary.

Syntax:

dict.clear()

Parameters: NA

Return Value: This method has no return value.

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

Approach:

• Give the dictionary by initializing it with some random values and store it in a variable.
• Print the above-given dictionary before clearing.
• Calculate the length of the given dictionary using the len() function and print it.
• Apply clear() function to the given dictionary.
• Print the above-given dictionary after clearing it.
• Calculate the length of the above dictionary after clearing using the len() function and print it.
• The Exit of the program.

Below is the implementation:

# Give the dictionary by initializing it with some random values and store it
# in a variable.
gvn_dictinry = {'hello': 100, 'this': 200, 'is': 300, 'btechgeeks': 400}
# Print the above-given dictionary before clearing.
print("The given dictionary before clearing is :")
# Calculate the length of the given dictionary using the len() function and print it.
print(gvn_dictinry)
print("The length of the given dictionary before clearing = ", len(gvn_dictinry))
# Apply clear() function to the given dictionary.
gvn_dictinry.clear()
# Print the above-given dictionary after clearing it.
print("The given dictionary After clearing is :")
print(gvn_dictinry)
# Calculate the length of the above dictionary after clearing using the len() function
# and print it.
print("The length of the given dictionary After clearing = ", len(gvn_dictinry))


Output:

The given dictionary before clearing is :
{'hello': 100, 'this': 200, 'is': 300, 'btechgeeks': 400}
The length of the given dictionary before clearing =  4
The given dictionary After clearing is :
{}
The length of the given dictionary After clearing =  0

### 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 before clearing.
• Calculate the length of the given dictionary using the len() function and print it.
• Apply clear() function to the given dictionary.
• Print the above-given dictionary after clearing it.
• Calculate the length of the above dictionary after clearing using the len() function and print it.
• The Exit of the program.

Below is the implementation:

# Take a dictionary and initialize it with an empty dictionary using dict() or {}.
gvn_dict = {}
# 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_dict[keyy] = valuee

# Print the above-given dictionary before clearing.
print("The given dictionary before clearing is :")
# Calculate the length of the given dictionary using the len() function and print it.
print(gvn_dict)
print("The length of the given dictionary before clearing = ", len(gvn_dict))
# Apply clear() function to the given dictionary.
gvn_dict.clear()
# Print the above-given dictionary after clearing it.
print("The given dictionary After clearing is :")
print(gvn_dict)
# Calculate the length of the above dictionary after clearing using the len() function
# and print it.
print("The length of the given dictionary After clearing = ", len(gvn_dict))


Output:

Enter some random number of keys of the dictionary = 5
Enter key and value separated by spaces = good 1
Enter key and value separated by spaces = morning 2
Enter key and value separated by spaces = this 3
Enter key and value separated by spaces = is 4
Enter key and value separated by spaces = btechgeeks 5
The given dictionary before clearing is :
{'good': '1', 'morning': '2', 'this': '3', 'is': '4', 'btechgeeks': '5'}
The length of the given dictionary before clearing = 5
The given dictionary After clearing is :
{}
The length of the given dictionary After clearing = 0