what is dictionary comprehension in python code example

Example 1: types of dict comprehension

# Dictionary Comprehension Types

{j:j*2 for i in range(10)}

#using if 
{j:j*2 for j in range(10) if j%2==0}

#using if and 
{j:j*2 for j in range(10) if j%2==0 and j%3==0}

#using if else
{j:(j*2 if j%2==0 and j%3==0 else 'invalid' )for j in range(10) }

Example 2: dictionary comprehension in python

# dictionary comprehension
# these are a little bit tougher ones than list comprehension

sample_dict = {
    'a': 1,
    'b': 2,
    'c': 3,
    'd': 4,
    'e': 5
}

# making squares of the numbers using  dict comprehension
square_dict = {key:value**2 for key, value in sample_dict.items()}
print(square_dict)

square_dict_even = {key:value**2 for key, value in sample_dict.items() if value % 2 == 0}
print(square_dict_even)

# if you don't have a dictionary and you wanna create a dictionary of a number:number**2
square_without_dict = {num:num**2 for num in range(11)}
print(square_without_dict)