Python Academy · Lesson

for Loops and range()

Iterate over sequences and ranges with for loops.

Lesson 2 of 414 steps

for Loops and range() is a free Python Academy lesson on CoddyKit. This is lesson 2 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Python Academy learning path, and your progress syncs across the web and the CoddyKit app. The Python Academy course includes 4 lessons in total.

Introduction

The for loop iterates over any iterable. range() generates integer sequences on demand.

Basic for Loop

for item in iterable: runs the block once per item. Works with lists, strings, dicts, sets, files — anything iterable.

for fruit in ['apple', 'banana', 'cherry']:
    print(fruit)

range(stop)

range(5) generates 0,1,2,3,4. The stop value is exclusive.

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

range(start, stop)

range(2, 7) generates 2,3,4,5,6. Start is inclusive, stop is exclusive.

for i in range(2, 7):
    print(i)

range(start, stop, step)

range(0, 10, 2) generates 0,2,4,6,8. range(10, 0, -1) counts down.

for i in range(0, 10, 2):
    print(i)

enumerate()

enumerate(lst) yields (index, value) tuples. Use it instead of range(len(lst)) to avoid index gymnastics.

fruits = ['apple', 'banana']
for i, f in enumerate(fruits, start=1):
    print(i, f)

zip()

zip(a, b) pairs elements from two iterables. Stops at the shorter one.

names = ['Alice', 'Bob']
ages = [30, 25]
for name, age in zip(names, ages):
    print(name, age)

Iterating Dicts

for key in d: iterates keys. for k, v in d.items(): iterates key-value pairs.

d = {'a': 1, 'b': 2}
for k, v in d.items():
    print(k, v)

Comprehension vs Loop

[x**2 for x in range(10)] is a concise for-loop that builds a list. Prefer comprehensions when the logic is simple.

squares = [x**2 for x in range(10)]
print(squares)

for with else

A for loop can have an else clause that runs only if the loop completed without a break.

for i in range(5):
    if i == 9:
        break
else:
    print('no break')

Unpacking in for Loops

for a, b in [(1,2),(3,4)]: unpacks each tuple. Works for any iterable of fixed-length sequences.

pairs = [(1,'a'),(2,'b')]
for num, ch in pairs:
    print(num, ch)

Quick Check

What does enumerate(['a','b','c'], start=1) yield first?

Answer it in the interactive lesson

Recap

for loops iterate over any iterable. range(start,stop,step) generates integers. Use enumerate() for index+value, zip() for parallel iteration.

Keep Going

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Frequently Asked Questions

Is the “for Loops and range()” lesson free?

Yes — the full text of “for Loops and range()” is free to read here on the web. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Python Academy course, upgrade to CoddyKit PRO. The Python Academy course includes 4 lessons in total.

What will I learn in “for Loops and range()”?

Iterate over sequences and ranges with for loops. You practise Python Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.

Do I need any experience to start Python Academy?

No prior experience is required. Python Academy on CoddyKit is structured for beginners through advanced learners, so you can start here or from the beginning and move at your own pace. This is lesson 2 of 4.

How long does the “for Loops and range()” lesson take?

Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.

Can I write and run code in this Python Academy lesson?

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