Op 21-08-18 om 13:16 schreef Jacob Braig:
I am just starting out coding and decided on python. I am confused with
something I go shooting a lot so i wanted to make some stupid easy
calculator for ammo and slowly build the program up when I understand
python better but the code I have now keeps popping up an error and I don't
understand where i went wrong a little help please.
Here is the code like I said very simple stuff.
"""
This is a simple program for ammo calculation.
Created by Jacob
"""
AMMO = " This is how much ammo remains for .40 pistol %s. "
print "Program has started."
ammopistol = raw_input("Enter total ammo before use. ")
ammopused = raw_input("Enter total ammo used. ")
ammopleft = ammopistol - ammopused
print AMMO % (ammopistol, ammopused,) ammoleft
I am having issues with " ammopleft = ammopistol - ammopused " any idea
where I have gone wrong?
Always include the full traceback (error message).
The problem is that raw_input() returns a string, so you are doing
something like "10" - "2" instead of 10 - 2 for example. The error
message should have told you so:
TypeError: unsupported operand type(s) for -: 'str' and 'str'
The solution is to cast these inputs to integers, either directly during
input:
ammopistol = int(raw_input("Enter total ammo before use. "))
ammopused = int(raw_input("Enter total ammo used. "))
Or during calculation:
ammopleft = int(ammopistol) - int(ammopused)
Next issue will be your print statement. See the following website on
how to properly format strings: https://pyformat.info/
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