Little problem with the "+" operator
Joshua Marshall
jmarshal at mathworks.com
Mon Mar 5 12:25:46 EST 2001
Steve Purcell <stephen_purcell at yahoo.com> wrote:
> Zamurai wrote:
>> variableOne = 500
>> myVariable = variableOne + "cool"
>>
>> But I get the following error: "unsupported operand types for +"
>>
>> Does someone know how to solve the problem?
> You can't add variables of different types together in Python and expect them
> to magically agree on a sensible result.
> So, you have to explicitly say:
>>>> variableOne = 500
>>>> myVariable = str(variableOne) + "cool"
>>>> myVariable
> '500cool'
>>>>
> Or,
>>>> variableOne = 500
>>>> myVariable = variableOne + int("cool")
> Traceback (innermost last):
> File "<stdin>", line 1, in ?
> ValueError: invalid literal for int(): cool
>>>>
> This is infinitely more sane than:
> % perl -e 'print 500 + "cool"'
> 500
Comparing Python to Perl here doesn't seem very fair. They're very
different languages. In general, I'm surprised by the urgency with
which people often jump to compare them.
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