Printing mixtures in integers and strings

[Enrique]

Hi Neil,

Neil Benn wrote:
> 
> Hello,
> 
>             I'm trying to use something like this:-
> 
> def move(row): #Moves the dispenser to the row on the plate
>     print "Moved to Row - " + row

You are trying to add (operator "+") a number and a string

> 
>     Where row is expected to be a number.  However when I import this into
> teh interpreter I get an error message - stating that __add__ and __radd__
> have not been defined:-
> 
> Traceback (innermost last):
>   File "<console>", line 1, in ?
>   File "c:\projects\scripting\TrialScripting\AcmeBRD.py", li
> TypeError: __add__ nor __radd__ defined for these operands
> 

Which is the expected result since built-in strings and ints
do not add together
You can modify __add__ or __radd__ methods in these object
so they know how to add a number a string or the opposite.


It's easier to convert number to string : print "Moved to
Row - " + str(row), 
or let's 'print' to do this conversion : print "Moved to Row
- ", row
(prints string "Moved to Row - " and then prints printable
form of var "row" which happens to be str(row))

Enrique