Python String swapcase()
Summary: in this tutorial, you’ll learn about the Python string swapcase() method to return a copy of a string with all lowercase characters converted to uppercase and vice versa.
Introduction to the Python String swapcase() method
The string swapcase() method returns a copy of a string with all lowercase characters converted to uppercase and vice versa.
The following shows the syntax of the swapcase() method:
str.swapcase()
If you use English characters, the str.swapcase().swapcase() will be the same as str.
However, it’s not always true for non-English characters. In other words, the following expression will not always be True:
str.swapcase().swapcase() == str
Python String swapcase() method examples
The following example uses the string swapcase() method to return a copy of string with the letter case reversed:
message = 'Hello'
new_message = message.swapcase()print(new_message)
Output:
hELLO
The following example illustrate how to use the string swapcase() method with the non-English characters.
color = 'weiß'
print(color)new_color = color.swapcase()
print(new_color)
print(color.swapcase().swapcase())
print(color.swapcase().swapcase() == color) # False
Output:
weiß
WEISS
weiss
False
The word 'weiß' is a German word. It means white in English. And the letter 'ß' is equivalent to 'ss'.
The expression color.swapcase() returns 'WEISS'. So the expression color.swapcase().swapcase() returns 'weiss'.
Therefore, expression color.swapcase().swapcase() == color returns False.
Summary
- Use the Python string
swapcase()method to return a copy of a string with all lowercase characters converted to uppercase and vice versa.