On 20/05/2010 10:49, Giampaolo Rodolà wrote:
2010/5/20 John Arbash Meinel<john.arbash.mei...@gmail.com>:
Giampaolo Rodolà wrote:
class A:
... def echo(self, x):
... return x
...
a = A()
a.echo()
Traceback (most recent call last):
File "<stdin>", line 1, in<module>
TypeError: echo() takes exactly 2 arguments (1 given)
I bet my last 2 cents this has already been raised in past but I want
to give it a try and revamp the subject anyway.
Is there a reason why the error shouldn't be adjusted to state that
*1* argument is actually required instead of 2?
Because you wouldn't want to have
A.echo()
Say that it takes 1 argument and (-1 given) ?
John
=:->
I see that as a different error type: what you're doing there is
calling a method of a class which you haven't instantiated in the
first place.
Actually the error message returned in this other case is not very
clear as well:
"unbound method echo() must be called with A instance as first
argument (got nothing instead)"
It talks about "arguments" while no arguments are actually involved in
the problem: just a class I forgot to initialize.
Although the pattern of calling an unbound method with an instance as
the first argument (self) is not uncommon - and if you're doing
Class.method() that not only looks like what you're doing but is also an
accurate error message.
I would also expect that accidentally calling unbound methods is a much
less common error than calling bound methods with the wrong number of
arguments...
All the best,
Michael Foord
--- Giampaolo
http://code.google.com/p/pyftpdlib
http://code.google.com/p/psutil
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