Lamdba forms

[lsmith234]

hi all, I am a python newbie. why functions created with lambda forms
cannot contain statements?
how to get unnamed function with statements?

 

[Terry Reedy]

hi all, I am a python newbie. why functions created with lambda forms
cannot contain statements?

Because statement do not fit in expressions.

how to get unnamed function with statements?

Can't.

Many discussions in archives (which Google has).

tjr

 

[Paddy]

To expand on the above, Python does not have statements in its lambda
forms, but that does not stop pythoneers from getting the job done.

I use a named function for that, but if you have an issue with that, it
really is worth following Terry's advice as the subject has been
tackled at great length before.

- Cheers, Paddy.

 

[Ant]

Why does the function have to be unnamed? you can easly nest function
definitions and refer to them. IIRC the lambda form is probably going
to be removed at some point, as it is not needed:

def outerfn():
dostuff()
def inner(x,y):
out = (x^y)
print out
return out

my_local_function = inner
my_local_function(3,4)

outerfn()

 

[Duncan Booth]

IIRC the lambda form is probably going
to be removed at some point, as it is not needed:

You remember incorrectly.

 

[Ant]

No, I remembered correctly:
http://www.artima.com/weblogs/viewpost.jsp?thread=98196
but probably not until Python 3.0.

 

[Fredrik Lundh]

No, I remembered correctly:
http://www.artima.com/weblogs/viewpost.jsp?thread=98196
but probably not until Python 3.0.

however,

http://mail.python.org/pipermail/python-dev/2006-February/060415.html

(one would have thought that someone might have added a note to
the comments of the first post, but the most recent contributor to
that thread is a mortgage spammer...)

</F>

 

[Ant]

Fair enough. I've just found this as well, which implies that lambda
isn't being killed off in 3.0:

http://www.python.org/dev/peps/pep-3100/

In particular:
"Lambdas will have to be parenthesized [23]"

 

[Duncan Booth]

Fair enough. I've just found this as well, which implies that lambda
isn't being killed off in 3.0:

http://www.python.org/dev/peps/pep-3100/

In particular:
"Lambdas will have to be parenthesized [23]"

Also: http://www.python.org/doc/essays/ppt/accu2006/Py3kACCU.ppt
slide 14.