Re: confused about __str__ vs. __repr__

[Gabriel Genellina]

En Thu, 18 Dec 2008 14:05:32 -0200, Mikael Olofsson <mik...@isy.liu.se>
escribió:

Diez B. Roggisch wrote:

Yep. And it's easy enough if you don't care about them being different..
 def __repr__(self):
    return str(self)

If I ever wanted __str__ and __repr__ to return the same thing, I would make them equal:

def __str__(self):
     return 'whatever you want'
__repr__ = __str__

That makes it more obvious to me what's going on. As a bonus, it saves one method call for every repr call.

It's even easier to define only __repr__, __str__ defaults to it:

class OnlyRepr(object):

...   def __repr__(self): return "repr called"
...

class OnlyStr(object):

...   def __str__(self): return "str called"
...

class Both(OnlyRepr, OnlyStr):

...   pass
...

r = OnlyRepr()
s = OnlyStr()
b = Both()
print "only repr:", repr(r), str(r)

only repr: repr called repr called

print "only str: ", repr(s), str(s)

only str:  <__main__.OnlyStr object at 0x00BA10F0> str called

print "both:     ", repr(b), str(b)

both:      repr called str called

--
Gabriel Genellina

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