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Comprehension

List Comprehension:

# Basic list comprehension
new_list = [expression for item in iterable if condition]

# Example:
numbers = [1, 2, 3, 4, 5]
squared = [x**2 for x in numbers if x % 2 == 0]  # squares of even numbers

Set Comprehension:

# Basic set comprehension
new_set = {expression for item in iterable if condition}

# Example:
numbers = [1, 2, 3, 4, 5, 4, 3, 2, 1]  # Duplicate numbers
unique_numbers = {x for x in numbers}  # Set of unique numbers

Dictionary Comprehension:

# Basic dictionary comprehension
new_dict = {key_expression: value_expression for item in iterable if condition}

# Example:
numbers = [1, 2, 3, 4, 5]
squared_dict = {x: x**2 for x in numbers}  # Square of each number as key-value pairs

Generator Expression:

# Basic generator expression
gen = (expression for item in iterable if condition)

# Example:
numbers = [1, 2, 3, 4, 5]
even_squared = (x**2 for x in numbers if x % 2 == 0)  # Generator for squares of even numbers

Nested Comprehensions:

Comprehensions can be nested within each other.

# Nested list comprehension
nested_list = [[i * j for j in range(3)] for i in range(3)]

# Nested dictionary comprehension
nested_dict = {i: {j: i * j for j in range(3)} for i in range(3)}

Conditional Ternary Expression (Not exactly a comprehension, but often used in conjunction):

# Basic ternary expression
x = 'Even' if num % 2 == 0 else 'Odd'

Reference

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