On 2010-04-07 11:06 AM, Tom Evans wrote:
On Wed, Apr 7, 2010 at 4:10 PM, geremy condra<debat...@gmail.com> wrote:
On Wed, Apr 7, 2010 at 10:53 AM, Tom Evans<tevans...@googlemail.com> wrote:
[ Please keep me cc'ed, I'm not subscribed ]
Hi all
I've written a bunch of internal libraries for my company, and they
all use two space indents, and I'd like to be more consistent and
conform to PEP-8 as much as I can.
My problem is I would like to be certain that any changes do not alter
the logic of the libraries. When doing this in C, I would simply
compile each module to an object file, calculate the MD5 of the object
file, then make the whitespace changes, recompile the object file and
compare the checksums. If the checksums match, then the files are
equivalent.
Is there any way to do something semantically the same as this with python?
Probably the logical thing would be to run your test suite against
it, but assuming that's not an option, you could run the whole
thing through dis and check that the bytecode is identical. There's
probably an easier way to do this though.
Geremy Condra
dis looks like it may be interesting.
I had looked a little at the bytecode, but only enough to rule out md5
sums as a solution. Looking closer at the bytecode for a simple
module, it seems like only a few bytes change (see below for hexdumps
of the pyc).
So in this case, only bytes 5 and 6 changed, the rest of the file
remains exactly the same. Looks like I need to do some digging to find
out what those bytes mean.
You will also have to be careful about docstrings. If you are cleaning up for
style reasons, you will also end up indenting the triple-quoted docstrings and
thus change their contents. This will be reflected in the bytecode.
In [1]: def f():
...: """This is
...: a docstring.
...: """
...:
...:
In [2]: def g():
...: """This is
...: a docstring.
...: """
...:
...:
In [3]: f.__doc__
Out[3]: 'This is \n a docstring.\n '
In [4]: g.__doc__
Out[4]: 'This is\n a docstring.\n '
--
Robert Kern
"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
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