The lower Method in Python: Converting String Characters to Lowercase

The lower method returns a copy of the original string with characters converted to lowercase. The algorithm for this conversion is described in paragraph 3.13 of the Unicode standard.

lower()¶

'SoMe ElePhants'.lower()  # 'some elephants'

To convert string characters to uppercase, use the upper method. To check if a string contains only lowercase characters, use islower.

The expression lower().islower() may return False if the string contains only characters that do not support case conversion:

'12'.lower().islower()  # False