Module 8 of 15 · Step 1 of 16

for Loops

Repetition means asking Python to perform a set of instructions for several values. A for loop takes one value at a time from a sequence such as range(), text, or a list.

By the end of this lesson, you can:

Read loop syntax and indentation
Use all three range forms
Visit text and list items
Filter values inside a loop

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Learn · Repeat an indented instruction

Concept 1 of 7

Repeat an indented instruction

A for loop takes one value at a time. The temporary name after for is the loop variable; it receives the next value each repetition. The colon begins the indented loop body.

Pattern

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

Code

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

Output

Why it works

for starts the loop and number is its changing loop variable.
range(5) supplies 0, 1, 2, 3, 4.
The colon starts the block; the indented print runs for each value.

Remember: range(5) does not include 5. The stop value is excluded.

Common mistake

Not this

for number in range(5)
print(number)

Try this

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

A missing colon or indentation prevents the loop body from running correctly.