Question

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python .rstrip removes one additional character

What is the problem here? it seems that rstrip removes more than necessary in the one to the last line of code.

s = 'LedArray.py'
s.rstrip('y')
'LedArray.p'

s.rstrip('py')
'LedArray.'

s.rstrip('.py')
'LedArra'

s.rstrip('y.py')
'LedArra'

Answer 1

rstrip takes “characters to remove”, not “exact substring to remove” argument. .py and y.py are equivalent as sets. In fact, you could do y.p and it’d still remove the same characters.