[Tutor] role playing game - help needed

Peter Otten __peter__ at web.de
Wed Dec 8 00:29:40 CET 2010

Al Stern wrote:

> I used the following code and got the following error.

The result of input is always a string. 
> attributes["strength"] = input("\nHow many points do you want to assign to
> strength?: ")

Say you type 42 when you run your script. Then the above assignment is 

attributes["strength"] = "42"

and when you loop over the values you try to add a string to an integer 
which is what Python complains about:

>>> 42 + "42"
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for +: 'int' and 'str'

To get an integer you have to convert the string explicitly:

>>> 42 + int("42")

The best place to do that is as early as possible, even before you put the 
value into the dictionary:

attributes["strength"] = int(input(...))

(In a real application you'd guard against values that cannot be converted 
to integers)

> #point allocation
> point_total = 0
> for val in values:
>     point_total += val
> print (point_total)
> and get this error...
> Traceback (most recent call last):
> File "C:\Users\Public\Documents\My Python programs\role_playing_game1.py",
> line 26, in <module>
> point_total += val
> TypeError: unsupported operand type(s) for +=: 'int' and 'str'

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