Getting error message: AttributeError: 'list' object has no attribute 'lower' in Python

Question

I have the problem, that I am trying to run a function which has as input an array of strings and before making some if-statement I am lowering the strings. somehow i am receiving the error message

AttributeError: 'list' object has no attribute 'lower'

It is not clear for me why do I receive it. The funny part is, If I have both in one script it works. If I source the function out and load it into another script it does not work. The code looks like the following:

def Calc(String_Array1, String_Array2):
    String_Array1 = String_Array1.lower()
    String_Array2 = String_Array2.lower()

    if String_Array1 == "a":
        print(String_Array1)  
    elif String_Array2 == "b":
        print(String_Array2)
    else:
        raise Exception("Something went wrong")


    return 0

I am running then my own module like the following

import helper_module as hm

String_Array1 = ["A"]    
String_Array2 = ["B"]

test = hm.CalcFXFwdCurve(String_Array1,String_Array2)

print(test)

`lower()` method is applicable to python string objects not list objects. — Abdul Niyas P M, Nov 17 '17 at 06:43
Not sure how it works in your other script but to convert the strings in the list to lower case, you can use `map(str.lower, String_Array1)` — eugenhu, Nov 17 '17 at 06:45
exactly, you have to pass strings to your function, like 'abc' — Juergen, Nov 17 '17 at 06:46
`["A"].lower()` won't work because `lower` is a string-function. `["A"][0].lower()` will work on the string. — Nir Alfasi, Nov 17 '17 at 06:46
@all, thanks. It seems to work when I am looping over my function. Then the error message does not occure... — JonDoe, Nov 17 '17 at 06:50
@eugenhu, thanks. doing it will not help because the if statement recognize the sting no more and my if-condition fails — JonDoe, Nov 17 '17 at 07:23
@ABDULNIYASPM, thanks. do you have a better suggestion? Since my string array will be more than one item how should it look like? — JonDoe, Nov 17 '17 at 07:24
@Juergen, thanks but do you have an eyample how it shoul look like? — JonDoe, Nov 17 '17 at 07:25

score 0 · Answer 1 · answered Nov 17 '17 at 07:56

0

So the solution works with an numpy array using char.lower(). The the if-statement can be performed using any() or all()

answered Nov 17 '17 at 07:56

JonDoe

107
7

Getting error message: AttributeError: 'list' object has no attribute 'lower' in Python

1 Answers1