Why I hate lambdas (Re: Do any of you recommend Python as afirst programming language?)

[Arnaud Delobelle]

On Mar 24, 1:26 pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Mon, 24 Mar 2008 04:33:53 -0400, Terry Reedy wrote:
> > The fact that .func_name (which is writeable) is not used at first
> > surprised me until I remembered that code objects can potentially be
> > used by multiple function objects and hence are not connected to any one
> > in particular.
>
> How does that happen?

Like this:

>>> def foomaker(x):
...     def foo(y): return x+y
...     return foo
...
>>> foo1 = foomaker(1)
>>> foo2 = foomaker(2)
>>> foo1.func_code
<code object foo at 0x73530, file "<stdin>", line 2>
>>> foo2.func_code
<code object foo at 0x73530, file "<stdin>", line 2>

Of course foo1 and foo2 are not the same thing:

>>> foo1(8)
9
>>> foo2(8)
10

> And if it is the case, what's the justification for giving them a co_name
> attribute? Surely the name of the function should be that of the function
> object, not of one of the shared parts?

>>> foo1.__name__
'foo'
>>> foo1.func_code.co_name
'foo'

As seen above, func.__name__ and func.func_code.co_name are the same
thing (until tampered with).

--
Arnaud