Unexpected behavior with strings comparision python

Question

This is a very simple function in Python

def not_string(str1):
    if str1[0:3] is "not":
        return str1
    else:
        return 'not ' + str1

str1 = 'not bad'
print(not_string(str1))

The output of the above code should be "not bad" but the Python is showing output as "not not bad. Can anyone explain what I am missing here?

Samuel Littley · Accepted Answer · 2015-12-03 23:35:07Z

2

The is operator in Python tests for object equality rather than value equality. What you want is for your if statement to be if str1[0:3] == "not":

answered Dec 3, 2015 at 23:35

Samuel Littley

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