str.zfill() ⚬ Entries

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str.zfill() ⚬｜Documentation｜1st｜20251021115011-00-⌔

Built-in Types — Python 3 documentation#str.zfill

str.zfill(width,/)

Return a copy of the string left filled with ASCII '0' digits to make a string of length width. A leading sign prefix ('+'/'-') is handled by inserting the padding after the sign character rather than before. The original string is returned if width is less than or equal to len(s).

For example:

>>> "42".zfill(5)
'00042'
>>> "-42".zfill(5)
'-0042'

See also rjust().

Printed 2026-06-28.

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