⚡ List Comprehension

# Traditional loop se
squares = []
for i in range(1,6):
    squares.append(i**2)
print(squares)  # [1,4,9,16,25]

# List comprehension se — ek hi line mein!
squares = [i**2 for i in range(1,6)]
print(squares)  # [1,4,9,16,25]

# Sirf even numbers
evens = [x for x in range(20) if x % 2 == 0]
print(evens)

# Sirf passing marks
marks = [45, 80, 25, 90, 55, 10]
passed = [m for m in marks if m >= 33]
print(f"Pass: {passed}")

# Dict comprehension
words = ["apple", "banana", "mango"]
lengths = {w: len(w) for w in words}
print(lengths)

# 3x3 matrix
matrix = [[i*j for j in range(1,4)] for i in range(1,4)]
for row in matrix:
    print(row)

# Flatten 2D list
flat = [x for row in matrix for x in row]
print(flat)

# Chapter 16: List Comprehension — Advanced Practice
print("=== List Comprehension Practice ===")

# Example 1: Basic usage
result = "Python mein List Comprehension bahut powerful hai!"
print(result)

# Example 2: Real world use
data = ["List Comprehension", "Python", "Hindi", "PythonHindi.in"]
for item in data:
    print(f"Item: {item}")

print("\nPractice complete! Great job! 🎉")

# Chapter 16: List Comprehension — Advanced Examples
# Yeh code copy karo aur run karo!

# Example 1: Basic concept
print("=== Chapter 16: List Comprehension ===")

# Example 2: List operations
items = ["Python", "Hindi", "Code", "Practice"]
for i, item in enumerate(items, 1):
    print(f"{i}. {item}")

# Example 3: Dictionary usage
chapter_info = {
    "number": 16,
    "title":  "List Comprehension",
    "level":  "Intermediate",
    "done":   False
}
for key, value in chapter_info.items():
    print(f"  {key:10}: {value}")

# Example 4: Function
def practice_summary(chapter, completed=False):
    status = "Complete ✅" if completed else "In Progress ⏳"
    return f"Chapter {chapter}: {status}"

print(practice_summary(16))
print(practice_summary(16, True))