List, Set और Dictionary Comprehension

List Comprehension क्या है?

List Comprehension ka matlab hai: List comprehension creates a new list in a compact and readable way using an expression and a loop. Simple words me, ye topic practical Python programs likhne me direct use hota hai.

Is topic ko sirf definition ke liye nahi, balki filtering lists quickly jaise real examples ke liye practice karein.

यह क्यों सीखना जरूरी है?

• Ye filtering lists quickly me kaam aata hai.
• Ye transforming data in one line se bhi connected hai.
• Isse aap code ka output aur errors better samajh paate hain.

Important Terms

Syntax / Basic Pattern

Basic idea: pehle data तैयार करें, phir Python logic apply करें, aur finally result display करें.

numbers = [1, 2, 3, 4, 5, 6]
squares = [n * n for n in numbers]
even_squares = [n * n for n in numbers if n % 2 == 0]
print(squares)
print(even_squares)

Complete Example Program

numbers = [1, 2, 3, 4, 5, 6]

squares = [n * n for n in numbers]
even_squares = [n * n for n in numbers if n % 2 == 0]

print(squares)
print(even_squares)

Expected Output

Program Explanation

• numbers = [1, 2, 3, 4, 5, 6] stores a value in numbers.
• squares = [n * n for n in numbers] stores a value in squares.
• even_squares = [n * n for n in numbers if n % 2 == 0] performs the next step of the program logic.
• print(squares) displays information or calculated result on the screen.
• print(even_squares) displays information or calculated result on the screen.

Practical Uses

• Filtering lists quickly.
• Transforming data in one line.
• Writing concise readable code.

Common Mistakes

• Making code complex when a simple function or class is enough.
• Not handling possible errors or edge cases.
• Mixing project dependencies instead of using a virtual environment.

Practice Tasks

1. Program ko list-comprehension.py file me type karke run karein.
2. Values change karke output compare karein.
3. filtering lists quickly par ek छोटा example banayen.
4. Logic ko apne words me 5 lines me likhein.

सारांश

List Comprehension ko tab complete maanenge jab aap iska meaning, example, output aur practical use clearly explain kar saken.