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Python 3 reference · String Methods

Python String lower() Method

Return a copy of the string with all cased characters converted to lower case.

Python 3 Since 3.0

Syntax

str.lower()

Return value

A new string.

Examples

Basic useTry it yourself
print("Hello WORLD".lower())

Output

hello world
Case-insensitive input checkTry it yourself
answer = "YES"
if answer.lower() in ("y", "yes"):
    print("confirmed")

Output

confirmed

For case-insensitive comparisons across languages, prefer casefold().

Version history

VersionChange
Python 3.0Added
  • str.upper() · Return a copy of the string with all cased characters converted to upper case.
  • str.casefold() · Return a case-folded copy for caseless comparison. Stronger than lower(): it also handles special cases like German ß.
  • str.islower() · Return True if all cased characters are lower case and there is at least one cased character.
  • str.swapcase() · Return a copy with upper-case letters converted to lower case and vice versa.
  • Python Strings · tutorial