TypeError: 'in <string>' requires string as left operand, not list (Function)

Question

variableName=["display","screen","sound""audio"]
fileName=["PPP", "Abc"]
P1="PPP"
d="display"
s="screen"
ss="sound"
a="audio"
d=P1
loop=True
def CH(variableName, fileName, loop):
    while loop==True:
        Up=input("What is your problem?\n")
        if (variableName) in Up.lower():
            file = open(fileName + ".txt", "r")
            whole= file.read()
            print(whole)
            file.close()
            loop=False
        else:
            loop=True
            continue**

CH(variableName, fileName, loop)

I am trying to create a function that read your input and give an answer by using keywords. But the error ""TypeError: 'in ' requires string as left operand, not list"" keeps coming up and I can seem to fix it

What do you expect if (variableName) in Up.lower(): to do? — pp_
– pp_, Commented Mar 3, 2016 at 18:08

wpercy · Accepted Answer · 2016-03-03 18:10:05Z

2

I think you've got the logic of your in statement backwards. You should be checking

if Up.lower() in variableName:

not the other way around.

answered Mar 3, 2016 at 18:10

wpercy

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Comments

gtlambert · Accepted Answer · 2016-03-03 18:11:43Z

0

Using

if (variableName) in Up.lower():

....tests for the existence of a tuple (variableName) in a string Up.lower().

Since variableName is actually a list of strings, depending on what you are trying to achieve, you may well want to use one of the following instead:

if any(s in Up.lower() for s in variableName):

if all(s in Up.lower() for s in variableName):

The any() option will return True if any of the strings s in variableName are in Up.lower().
The all option will return True if all of the strings s in variableName are in Up.lower().

answered Mar 3, 2016 at 18:11

gtlambert

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Comments

wpercy · Accepted Answer · 2016-03-03 18:13:09Z

0

If variableName is a list, you can check membership with .__contains__().

Try changing the if statement to if variableName.__contains__(Up.lower):

edited Mar 3, 2016 at 18:13

wpercy

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answered Mar 3, 2016 at 18:08

MKreegs

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