Python for Loop

1. Basic for Loop with a Sequence

fruits = ["apple", "banana", "orange"]

for fruit in fruits:
    print(fruit)

Iterates over each element in a sequence.

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2. Using range() in for Loop

for i in range(5):
    print(i)

Generates numbers from 0 to 4 by default.

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3. Custom Start and Step with range()

for i in range(2, 10, 2):
    print(i)

Format: range(start, stop, step) Output: 2, 4, 6, 8

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4. Iterating Through a String

word = "Python"

for char in word:
    print(char)

Processes each character individually.

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5. Using for with Index via enumerate()

languages = ["Python", "Java", "C++"]

for index, lang in enumerate(languages):
    print(index, lang)

Provides both index and value during iteration.

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6. Nested for Loops

for i in range(3):
    for j in range(2):
        print(f"i={i}, j={j}")

A loop inside another loop, commonly used for matrices and grids.

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7. Using break in for Loop

for number in range(1, 10):
    if number == 5:
        break
    print(number)

Terminates the loop when the condition is met.

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8. Using continue in for Loop

for number in range(1, 6):
    if number == 3:
        continue
    print(number)

Skips the current iteration without stopping the loop.

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9. for Loop with else Clause

for num in range(3):
    print(num)
else:
    print("Loop completed successfully")

The else block executes when the loop finishes normally (not broken).

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10. Iterating Over Dictionaries

student = {"name": "Alice", "age": 22, "grade": "A"}

for key, value in student.items():
    print(key, ":", value)

Allows iteration over keys, values, or key–value pairs.

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