Question

So I’m trying to find an item in a list in python. Here is my function:

def operator(input):
    operatorlist = ['+', '-', '*', '/', '^', 'sin', 'cos']

    for i in operatorlist:
        if input is operatorlist[i]:
            return True

My code is breaking, and I can’t figure out why… any ideas?

I changed my code from:

def operator(input):
    if input is '+' or input is '-' or input is '*' or input is '/' or input is '^' or input is 'sin' or input is 'cos':
    return True

Because I was told that is was, essentially, stylistically dumb to write it that way.

Answer 1

One line :

return input in operatorlist

No need to do conditions here, the in operator already returns a boolean.