Format Python code

Format Python with consistent four-space indentation and readable line breaks.

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ToolPython Formatter
Input
Output
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How it works

Python tokens are indented from colon-delimited suites while strings, comments, brackets, and continuation lines are preserved. Formatting changes layout without executing code.

  • PEP 8 recommends four spaces.
  • Open brackets and continuations allow readable multiline expressions.

Worked example

Format Python code
Fix indentation in a Python function
Input
											def greet(name):
  if name:
    print(f'Hello {name}')
  else:
    print('Hello World')
Output
												def greet(name):
    if name:
    print(f'Hello {name}')
    else:
    print('Hello World')

When to use this

Pre-commit hooks, notebook exports, and code reviews format Python.

Edge cases

  • A colon inside a string is not a suite delimiter.
  • Triple-quoted strings preserve embedded indentation.
  • Backslashes and open brackets continue a statement without a new block.

References