On Sat, 19 Nov 2005 14:12:25 GMT, "guy lateur" <[EMAIL PROTECTED]> wrote:
>Hi all,
>
>Suppose you have this class:
>
>class foo:
> def bar():
>
>Suppose you also have the strings "foo" and "bar". How can you obtain the
>function foo.bar()?
Why don't you type these things into an interactive python session
and see what happens? Also, foo.bar will be an unbound method of foo,
not a function per se. You could experiment a little, e.g.,
>>> class foo:
... def bar():
...
File "<stdin>", line 3
^
IndentationError: expected an indented block
>>> class foo:
... def bar(): return 'bar is the name' # you could have done this
...
>>> foo.bar()
Traceback (most recent call last):
File "<stdin>", line 1, in ?
TypeError: unbound method bar() must be called with foo instance as first
argument (got nothing
instead)
>>> foo()
<__main__.foo instance at 0x02EF3D8C>
>>> foo.bar(foo())
Traceback (most recent call last):
File "<stdin>", line 1, in ?
TypeError: bar() takes no arguments (1 given)
>>> class foo:
... def bar(self): return self, 'bar is the name' # you could have done
this
...
>>> fooinst = foo()
>>> fooinst
<__main__.foo instance at 0x02EF756C>
>>> foo.bar(fooinst)
(<__main__.foo instance at 0x02EF756C>, 'bar is the name')
>>> fooinst.bar
<bound method foo.bar of <__main__.foo instance at 0x02EF756C>>
>>> fooinst.bar()
(<__main__.foo instance at 0x02EF756C>, 'bar is the name')
>>> foo.bar.im_func
<function bar at 0x02EF5764>
>>> foo.bar.im_func('first arg')
('first arg', 'bar is the name')
>>> fooinst.bar
<bound method foo.bar of <__main__.foo instance at 0x02EF756C>>
>>> fooinst.bar.im_func
<function bar at 0x02EF5764>
>>> fooinst.bar.im_func(1234)
(1234, 'bar is the name')
>>> fooinst.bar()
(<__main__.foo instance at 0x02EF756C>, 'bar is the name')
>>> foo.bar(333)
Traceback (most recent call last):
File "<stdin>", line 1, in ?
TypeError: unbound method bar() must be called with foo instance as first
argument (got int inst
ance instead)
>>> foo.bar(fooinst)
(<__main__.foo instance at 0x02EF756C>, 'bar is the name')
Someone can explain. If you do some of your own work, it will help even the
load.
Have you looked at any documentation? Start at http://www.python.org/
and click a few things. There seems to be a beginners guide link under
documentation
in the sidebar to the left ;-)
Regards,
Bengt Richter
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