For review: PEP 343: Anonymous Block Redux and Generator Enhancements

[Roy Smith]

It's important to note that nobody is against the PEP syntax. We are
only talking about adding things to it

In think the above is a contradiction in terms.

 

[Steven Bethard]

Since the current syntax would be there, the no-indentation syntax can
be explained in terms of the indentation syntax:

"""
To avoid over-indentation, a with-statement can avoid defining a new
indentation block. In that case, the end of the with block is the end
of the current indentation block.

with EXPR as VAR
REST OF BLOCK

is equivalent to

with EXPR as VAR:
BLOCK
"""

What do you think? I fail to see the complexity...

I guess my only real qualm about this is that I think it makes it harder
to see where __exit__() methods are called. When I compare:

def func(arg, baz):
foo = bar(arg)
with x as foo(baz)
x.frobble()
with y as x.bop()
return frabble(x, y)

with:

def func(arg, baz):
foo = bar(arg)
with x as foo(baz):
x.frobble()
with y as x.bop():
return frabble(x, y)

I find it much easier to identify in the second one that __exit__()
methods will be called right before the function returns (after the
return statement). YMMV.

BTW, if you really like the optional-indentation idea, you should post
it to the Wiki page (http://wiki.python.org/moin/WithStatement) --
Guido's been pretty quick to respond to any comments made there, so you
could get some feedback much more useful than I can give you.

STeVe