On Sunday 02 February 2003 11:04 pm, Samuele Pedroni wrote:
> With Guido's 'do': [notice that count is rebindable in the thunk]
>
> class iterclose:
> def __init__(self,iterwclose):
> self.iter = iterwclose
>
> def __call__(self,thunk):
> try:
> for x in self.iter:
> thunk(x)
> finally:
> self.iter.close()
>
> count = 0
> do iterclose(open('blah.txt')): (line):
> if line.find('Python') >=0:
> count += 1
> print line,
OK -- I *don't* get that " (line):" part, and how calling thunk() in
iterclose.__init__ binds/rebinds the local (?) variable line of the thunk.
Looks like black magic to me. Guess I must just be a bit thick
tonight -- sorry.
> class autoclose2:
> def __init__(self,file):
> self.file = file
>
> def __call__(self,thunk):
> try:
> thunk()
> finally:
> self.file.close()
>
> count = 0
> myfile = open('blah.txt')
> do autoclose2(open('blah.txt')):
> for line in myfile:
> if line.find('Python') >=0:
> count += 1
> print line,
shouldn't that be "do autoclose2(myfile):" ? or is there some
even-blacker magic in this "do" business that I don't get...?
Alex
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