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Python Crack (or: those features you're hooked on)
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Kllrnohj


/=\ PH34R |\/|3


Joined: 24 May 2005
Posts: 8189
Posted: 06 Mar 2009 09:29:13 pm    Post subject:
elfprince13 wrote:
Razz so you *do* still have to tell it what kind of formatting you want. granted, being able to pass in an object is a cool, but I'm having trouble envisioning a situation where that would be more useful than the old way of doing it.


Yes, but you don't have to specify the *TYPE* of the object. That is the point. Formatting stays the same regardless of the number's TYPE (indeed, regardless of the object type - classes can handle the format string however they want). The old way requires you to know the type.

Old busted way is basically sprintf - everything breaks if the type is wrong.

And honestly, who wants to remember if they are supposed to use %s or %d or %f or is it %F etc.... Especially in a language like Python where you never care what the type is - right up until you want to print it. I can't tell you how many times I've just done


Code:
print 'blah blah: %s' % str(some_argument)


because I didn't know what the type would be.
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elfprince13


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Joined: 23 May 2005
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Location: A galaxy far far away......
Posted: 06 Mar 2009 11:17:20 pm    Post subject:
on that note....the only thing that irks me about python occasionally is that when you print an object or try to concatenate it to a string it doesn't automatically call __str__() on the object.
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calc84maniac


Epic z80 roflpwner


Joined: 01 Aug 2006
Posts: 1503
Location: The ex-planet Pluto
Posted: 06 Mar 2009 11:19:07 pm    Post subject:
It doesn't? O_o That's a new one on me.
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elfprince13


OVER NINE THOUSAND!


Joined: 23 May 2005
Posts: 10234
Location: A galaxy far far away......
Posted: 07 Mar 2009 02:06:46 am    Post subject:
calc84maniac wrote:
It doesn't? O_o That's a new one on me.


nope, or at least not always. For example.


Code:
>>> print sabacc.players
[<sabacc.SabaccPlayer instance at 0x8e698>, <sabacc.SabaccPlayer instance at 0x8e6c0>, <sabacc.SabaccPlayer instance at 0x8e6e8>, <sabacc.SabaccPlayer instance at 0x8e710>]
>>> print [player.__str__() for player in sabacc.players]
['Name: Bob\tCredits: 189', 'Name: Fred\tCredits: 276', 'Name: Sally\tCredits: 335', 'Name: Harold\tCredits: 350']
>>> print sabacc.players[0]
Name: Bob       Credits: 189

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Kllrnohj


/=\ PH34R |\/|3


Joined: 24 May 2005
Posts: 8189
Posted: 07 Mar 2009 04:08:02 am    Post subject:
elfprince13 wrote:
on that note....the only thing that irks me about python occasionally is that when you print an object or try to concatenate it to a string it doesn't automatically call __str__() on the object.


Of course it doesn't. It calls repr() on it, which in turn invokes the class's __repr__() method.


Code:
>>> class foo:
...     def __repr__(self):
...             return "see?"
...
>>> class bar:
...     def __str__(self):
...             return 'heh'
...
>>> foo()
see?
>>> bar()
<__main__.bar object at 0x027C20B0>
>>> print(foo())
see?
>>> print(bar())
heh
>>>

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