how does rstrip work in python code example

Example 1: rstrip in python

text = "     Apple      "
x = txt.rstrip()
>>> '     Apple'
x.rstrip('e')
>>> '  Appl'
x.lstrip()
>>> 'Apple'

Example 2: rstrip python

txt = "     banana     "

x = 
    txt.rstrip()


    print("of all fruits", x, "is my favorite")