what is swapcase in python code example

Example 1: swapcase

str_swapcase = "what was that about?".swapcase()
print(str_swapcase)

Example 2: swapping upper case and lower case string python

# swapcase() method 

string = "thE big BROWN FoX JuMPeD oVEr thE LAZY Dog"
print(string.swapcase()) 

>>> THe BIG brown fOx jUmpEd OveR THe lazy dOG