two ideoms at one blow: line-reading and regexp-matching
François Pinard
pinard at iro.umontreal.ca
Wed Feb 20 10:27:49 EST 2002
[Russell Nelson]
> There are two Python ideoms that bother me:
> while 1:
> line = file.readline()
> if not line: break
Hello, Russell. Glad to see you here as well! :-)
For the above, I like writing:
line = file.readline()
while line:
...
line = file.readline()
even if I agree that there are cases it would be more awkward to do so,
like for example, when one does not want to conceal the line reading code
into a function.
> I'd really, really like it if you could do one(1) assignment within
> the boolean expression in a while and an if. Like this:
> while line = file.readline():
I would rather not see Python accepting this, first because it makes the
code less explicit, but also because it would more easily allow the error
of miswriting `==' as `=' unnoticed by the Python code reader.
> I just think it would be easier to read programs if they could be
> written like this.
Programs may get slightly easier to write, I doubt it would really make
them more legible, however. My feeling is that the current situation is
better than alternatives, all considered.
--
François Pinard http://www.iro.umontreal.ca/~pinard
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