[Tutor] functions in Python

[Eric Walker]

Payal Rathod wrote:

>On Mon, Apr 17, 2006 at 05:42:05PM +0100, Steve Nelson wrote:
>  
>
>>When you define a function, you are writing a block of code which you
>>can ask to perform a task.  The task may be simple, and not require
>>any additional information, or it may be more complex and need
>>information.
>>    
>>
>
>What is the difference between,
>
>  
>
>>>>def f(x):
>>>>        
>>>>
>...     return x
>...
>  
>
>>>>f(4)
>>>>        
>>>>
>4
>
>  
>
>>>>def f(x):
>>>>        
>>>>
>...     print x
>...
>  
>
>>>>f(4)
>>>>        
>>>>
>4
>
>Both give same results. So, why return statement is needed?
>With warm regards,
>-Payal
>_______________________________________________
>Tutor maillist  -  Tutor at python.org
>http://mail.python.org/mailman/listinfo/tutor
>
>  
>
New at this but the f(x) with the return statement passes the value back 
to be used in something. The one with the print statement just prints 
it. Correct me if I am wrong experts
def f(x):
    x = x + 1;
    return x

def g(x):
    x=x + 1;
    print x;

 >>> bob = 5 + f(5)
 >>> print bob

bob =Traceback (most recent call last):
  File "<stdin>", line 1, in ?
TypeError: unsupported operand type(s) for +: 'int' and 'NoneType' 5 + g(5)





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