"not all arguments converted during string formatting" taking modulus where isnumeric() is True

Question

while True:
    ans = input('Enter a number : ')
    if ans.isalpha():
        if ans == 'q':
            break
    elif ans.isnumeric():
        if ans == 1 or ans == 0:
            print('NOT even NOR odd number')
        elif ans % 2 == 0:
            print('EVEN number')
        else:
            print('ODD number')

and goes error like this:

Traceback (most recent call last):
  File "C:/Users/Me.Qa/Desktop/app0001.py", line 9, in <module>
    elif ans % 2 == 0:
TypeError: not all arguments converted during string formatting

Is there a reason why you're taking the modulus of a string? — Ignacio Vazquez-Abrams, Oct 27 '17 at 16:59
I think you intended to parse the string as a number before doing math on it or comparing it against numbers. Use `int`. — Carcigenicate, Oct 27 '17 at 17:00
I've tried to edit the title to be more specific and descriptive. Please try to make a title that's specific to the individual question being asked (so others know if a question's answers are likely to help them without needing to click through first) in the future. — Charles Duffy, Oct 27 '17 at 17:05

score 0 · Answer 1 · answered Oct 27 '17 at 17:02

0

You din't convert "ans" variable to int. Just add

ans = int(ans)

before

if ans == 1 or ans == 0:

answered Oct 27 '17 at 17:02

Val

39
7

Tanks dude, helpfull – japy Oct 27 '17 at 17:06

score 0 · Answer 2 · answered Oct 27 '17 at 17:03

0

ans is a String. You can't do math on a String; you need to parse it as a number first.

As noted in the comments, change you second part to:

elif ans.isnumeric():
    # int takes a string and returns 
    #  the number it represents
    num_ans = int(ans) 
    if num_ans == 1 or num_ans == 0:
        print('NOT even NOR odd number')
    elif num_ans % 2 == 0:
        print('EVEN number')
    else:
        print('ODD number')

answered Oct 27 '17 at 17:03

Carcigenicate

43,494
9
68
117

Tanks dude, helpfull – japy Oct 27 '17 at 17:06
You can do a few types of math on a string, you just can't do numeric math with it. – Ignacio Vazquez-Abrams Oct 28 '17 at 00:58
@IgnacioVazquez-Abrams What math can you do on a string? I don't know if string multiplication counts as math. – Carcigenicate Oct 28 '17 at 00:59
Concatenation, replication, and interpolation are all done via mathematical operators. – Ignacio Vazquez-Abrams Oct 28 '17 at 01:00
@IgnacioVazquez-Abrams Maybe because they use math operators to carry them out, but I don't think they really count as "math". I think you're splitting hairs here. – Carcigenicate Oct 28 '17 at 01:01

"not all arguments converted during string formatting" taking modulus where isnumeric() is True

2 Answers2