NoneType object is not subscriptable

Question

I am working on a seven-segment display project on Learnstreet. One of the required methods takes the input obtained from a text box which is labelled "inputString". Input String is then passed to the given method using text which is a string. Further description of the method is as given below -

In this method we have got the text from that input string, and we need to extract each character from it, and if it is a number, pass it on to our illuminate function to display that number using a 7-segment display.

Here is my code for parsing the string and extracting digits from the number.

def get_digits(text):
    num=int(text)
    while num!=0:
        print illuminate(num%10)
        num/=10

This code throws an error :

Traceback (most recent call last): File "", line 1, in File "", line 27, in test File "", line 17, in test_get_digits TypeError: 'NoneType' object is not subscriptable.

Because I am new to python, I don't understand what is causing this.Please help

Answer 1

One of the other requirements is to return something. Since your function returns nothing, None is implicitly returned, and this causes the test scaffolding to fail. Perhaps you should return a list containing the return values of each invocation of illuminate().