Lambda?!
klamidad
klamidad at wanadoo.es
Tue Sep 10 20:58:48 EDT 2002
Bo M. Maryniuck wrote:
> Python 2.0 (#1, Jan 19 2001, 17:54:27)
> [GCC 2.95.2 19991024 (release)] on linux2
> Type "copyright", "credits" or "license" for more information.
>>>> def foo(a):
> ... return "<%s>" % a
> ...
>>>> map(lambda bar: foo(bar).upper(), ['test', 'other test'])
> ['<TEST>', '<OTHER TEST>']
>
>
> Hura-a!
>
>
> Python 2.0 (#1, Jan 19 2001, 17:54:27)
> [GCC 2.95.2 19991024 (release)] on linux2
> Type "copyright", "credits" or "license" for more information.
>>>> class foo:
> ... def bar(self, a):
> ... return "<%s>" % a
> ... def spam(self):
> ... return map(lambda rope: self.bar(rope).upper(),
> ['test', 'other test']) ...
>>>> f = foo()
>>>> f.spam()
> Traceback (most recent call last):
> File "<stdin>", line 1, in ?
> File "<stdin>", line 5, in spam
> File "<stdin>", line 5, in <lambda>
> NameError: There is no variable named 'self'
>
>
> Huh?!
>
>
Python 2.1.3 (#1, Jul 29 2002, 22:34:51)
[GCC 2.95.4 20011002 (Debian prerelease)] on linux2
Type "copyright", "credits" or "license" for more information.
>>> class foo:
... def bar(self, a):
... return "<%s>" % a
... def spam(self):
... return map(lambda rope: self.bar(rope).upper(),
['test', 'other test'])
...
<stdin>:4: SyntaxWarning: local name 'self' in 'spam' shadows use of
'self' as global in nested scope 'lambda'
>>> f = foo()
>>> f.spam()
Traceback (most recent call last):
File "<stdin>", line 1, in ?
File "<stdin>", line 5, in spam
File "<stdin>", line 5, in <lambda>
NameError: global name 'self' is not defined
'self' local in 'spam' <---> 'self' global in 'lambda'
Python 2.1.3 (#1, Jul 29 2002, 22:34:51)
[GCC 2.95.4 20011002 (Debian prerelease)] on linux2
Type "copyright", "credits" or "license" for more information.
>>> class foo:
... def bar(self, a):
... return "<%s>" % a
... def spam(self):
... return map(lambda rope,slf=self: slf.bar(rope).upper(),
['test', 'other test'])
...
>>> f = foo()
>>> f.spam()
['<TEST>', '<OTHER TEST>']
Ahh!
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