How for Loops Work

• A for loop runs a set number of times based on the sequence it iterates over.
• It cannot run indefinitely.

Syntax:

for variable in sequence:
    # Code block to execute

Example: Iterating Over a List

fruits = ["Apple", "Banana", "Cherry"]
for fruit in fruits:
    print(fruit)

Output:

Apple
Banana
Cherry

Using range() in a for Loop

• The range() function generates a sequence of numbers.
• Used when looping a fixed number of times.

Syntax:

for i in range(start, stop, step):
    # Code block

Example: Looping a Fixed Number of Times

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

Output:

0
1
2
3
4

Example: Custom Step Value

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

Output:

2
4
6
8

Nested for Loops

• A for loop can be inside another for loop.
• Useful for working with multi-dimensional data.

Example:

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

Output:

i: 0, j: 0
i: 0, j: 1
i: 1, j: 0
i: 1, j: 1
i: 2, j: 0
i: 2, j: 1

Loop Control Statements: break and continue

• break statement: Exits the loop early.
• continue statement: Skips the current iteration and moves to the next.

Example of break:

for num in range(10):
    if num == 5:
        break  # Stops the loop when num is 5
    print(num)

Example of continue:

for num in range(10):
    if num % 2 == 0:
        continue  # Skips even numbers
    print(num)