Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #16655 > unrolled thread

Re: Fwd: class print method...

Back to article view | Back to comp.lang.python

This discussion starts older than the indexed window; earlier articles aren't shown. The article labeled Started by below is the oldest one visible, not the original post.

Contents

  Re: Fwd: class print method... Lie Ryan <lie.1296@gmail.com> - 2011-12-05 23:41 +1100

#16655 — Re: Fwd: class print method...

On 12/05/2011 10:18 PM, Suresh Sharma wrote:
>
> Pls help its really frustrating
> ---------- Forwarded message ----------
> From: Suresh Sharma
> Date: Monday, December 5, 2011
> Subject: class print method...
> To: "d@davea.name <mailto:d@davea.name>" <d@davea.name
> <mailto:d@davea.name>>
>
>
> Dave,
> Thanx for the quick response, i am sorry that i did not explain
> correctly look at the code below inspite of this i am just getting class
> object at memory location.I am sort i typed all this code on my android
> in a hurry so.indentation could.not.be.managed but this.similar code
> when i run all my objects created by class deck are not shown but stored
> in varioia meory locations. How can i display them.
>

I think you're in the right track, however I suspect you're running the 
code in the shell instead of as a script. The shell uses __repr__() to 
print objects instead of __str__(), so you either need to use 'print' or 
you need to call str(), note the following:

Python 2.7.2+ (default, Oct  4 2011, 20:06:09)
[GCC 4.6.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
 >>> suits = ['spades', 'clubs', 'diamonds', 'hearts']
 >>> ranks = ['A', '2', '3', '4', '5', '6', '7', '8', '9', '10', 'J', 
'Q', 'K']
 >>> class Card:
...     def __init__(self, rank, suit):
...         self.suit = suit
...         self.rank = rank
...     def __str__(self):
...         return suits[self.suit] + ' ' + ranks[self.rank]
...
 >>> Card(2, 3) #1
<__main__.Card instance at 0x7f719c3a20e0>
 >>> str(Card(2, 3)) #2 of your
'hearts 3'
 >>> print Card(2, 3) #3
hearts 3

In #1, the output is the __repr__() of your Card class; you can modify 
this output by overriding the __repr__() on your Card class.

In #2, the output is the __repr__() of a string, the string is the 
return value from __str__() of your Card class. The repr of a string is 
the string enclosed in quotes, which is why there is an extra pair of 
quotes.

In #3, you're 'print'-ing a string, the string is the return value from 
__str__() of your Card class. There's no extra quotes, since 'print' 
prints the string itself, not the repr of the string.

[toc] | [standalone]

Back to top | Article view | comp.lang.python

csiph-web