Indentation blocks

Learn Python's indentation-based block structure.

What is indentation?

In Python indentation shows which block a line of code belongs to. While other languages use curly braces { }, Python uses whitespace.

Lines after an if or for line are inside that block when they are indented. The standard indent is four spaces.

if True:
    print("Yes")
    print("Still inside the block")

If indentation is inconsistent Python raises an IndentationError. So follow the indent size your team uses.

Lines in the same block must be indented the same amount. If one line has a different number of spaces, Python raises an error.

if True:
    print("A")
      print("B")  # 6 spaces — error

Do not mix tabs and spaces. Make your editor convert tabs to spaces. PEP 8 recommends four spaces.

Write a block starting with if True:. Inside the block, print Indent works with print. Indent with four spaces.

Show example solution

if True:
    print("Indent works")

Complete the block

if True:
    ____("Yes")

Show answer

if True:
    print("Yes")