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need for help

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  need for help leonardo selmi <l.selmi@icloud.com> - 2013-03-01 19:35 +0100
    Re: need for help Alister <alister.ware@ntlworld.com> - 2013-03-01 22:01 +0000
    Re: need for help Rick Johnson <rantingrickjohnson@gmail.com> - 2013-03-01 14:59 -0800

#40285 — need for help

hi guys

i typed the following program:

class ball:
    def _init_(self, color, size, direction):
        self.color = color
        self.size = size
        self.direction = direction

    def _str_(self):
        msg = 'hi, i am a ' + self.size + ' ' + self.color + 'ball!'
        return msg

myball = ball('red', 'small', 'down')
print my ball

BUT I GOT THIS ERROR:

Traceback (most recent call last):
  File "/Users/leonardo/Documents/ball2.py", line 11, in <module>
    myball = ball('red', 'small', 'down')
TypeError: this constructor takes no arguments

can you kindly tell me what is wrong?
thanks a lot!

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#40297

On Fri, 01 Mar 2013 19:35:14 +0100, leonardo selmi wrote:

> hi guys
> 
> i typed the following program:
> 
> class ball:
>     def _init_(self, color, size, direction):
>         self.color = color self.size = size self.direction = direction
> 
>     def _str_(self):
>         msg = 'hi, i am a ' + self.size + ' ' + self.color + 'ball!'
>         return msg
> 
> myball = ball('red', 'small', 'down')
> print my ball
> 
> BUT I GOT THIS ERROR:
> 
> Traceback (most recent call last):
>   File "/Users/leonardo/Documents/ball2.py", line 11, in <module>
>     myball = ball('red', 'small', 'down')
> TypeError: this constructor takes no arguments
> 
> can you kindly tell me what is wrong?
> thanks a lot!

as far as I can see is_init_ should be __init__ (double underscore)



-- 
The autodecrement is not magical.
             -- Larry Wall in the perl man page

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#40301

On Friday, March 1, 2013 12:35:14 PM UTC-6, leonardo selmi wrote:
> class ball:
> 
> [...]
> 

Now that you've gotten the exceptions sorted, it may be time to join the *other* 99% of programmers by editing that class identifier. All class symbols should start with (at minimum) a capitol letter.

After you do that, you should start reading and adapting as much of the Python style guide you can handle.

  http://www.python.org/dev/peps/pep-0008/

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