Python for Loop

Loop Satellite

For Loops

Python's `for` loop iterates over any iterable—lists, dicts, generators, files. Master the helpers that make it shine.

Use enumerate/zipHandle loop else

Basics

for user in users:
    process(user)

• Works with any iterable (lists, tuples, generators, files, dicts).
• Use tuple unpacking inside loops for readability.

Using range()

for i in range(5):          # 0, 1, 2, 3, 4
    print(i)

for i in range(2, 10, 3):   # 2, 5, 8
    print(i)

• range(stop) counts from 0 up to (not including) stop.
• range(start, stop, step) gives full control over the sequence.

Helpers

for index, value in enumerate(items, start=1):
    ...

for name, score in zip(names, scores):
    ...

Iterating dictionaries

for key, value in mapping.items():
    ...

Next up in your learning path

While loops

Handle sentinel-driven iteration.

Companion

Loop control

Use break/continue effectively.

Practice

List comprehensions

Transform loops into expressions.

Tip