On 2009-10-29 15:48 PM, kj wrote:
How can one check that a Python script is lexically correct?
As my Python apps grow in complexity and execution, I'm finding it
more often the situation in which a program dies after a lengthy
(i.e. expensive) run because the execution reaches, say, a typo.
Of course, this typo needs to be fixed, but I'd like to find out
about it before I waste hours on a run that is bound to fail. Is
there any way to do this? I imagine the answer is no, because
given Python's scoping rules, the interpreter can't know about
these things at compile time, but I thought I'd ask.
I like using pyflakes. It catches most of these kinds of typo errors, but is
much faster than pylint or pychecker. That means I can hook up a key macro to
run it in my editor so I can use it frequently without hesitation (e.g. in Vim,
it is my makeprg for Python files).
It doesn't catch other stupid errors, of course. Try your best to write small,
simple, quick-to-run tests for each piece of functionality that you are working
on. Test the methods you've just coded independently of the rest of your code
using that small test before doing full hours-long runs of the whole program.
Bonus: you now have a suite of unit tests.
"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco