On Wed, Jun 30, 2010 at 9:52 PM, Mary Morris <marris1...@gmail.com> wrote:
> I need help with the following task for my new job:
> The code we're using is python, which I have never worked with before.
> Our AMS source code relies heavily on decorators.Things look something like
> this:
> @decomaker(argA, argB, ...)
> def func(arg1, arg2, ...):
> pass
> which is the same as
> func = decomaker(argA, argB, ...)(func)
> and
> @dec2
> @dec1
> def func(arg1, arg2, ...):
> pass
> func = dec2(dec1(func))
> Or when implemented the second example looks like:
> def dec1(func):
> def new_func(arg1, arg2, ...):
> ... do something...
> ret = func(arg1, arg 2, ...)
> ... do more things...
> return ret
> return new_func
>
> My first task is that there is an issue with the name new_func. When the
> program crashes, that is what shows up in the logs-which doesn't help debug
> anything. I need to find out every decorator and make sure it has a
> descriptive name. I was thinking I could write a simple script which would
> parse through all of the source files and find decorators-maybe by looking
> for the @ symbol? Then I could manually check to make sure it has a good
> name. I was thinking I could copy the searching code from find_imports.py
> (up to the startswith() calls) and print the list of decorators found and
> which files that they're in. I have never worked with python before so I
> definitely need help with this task-any suggestions or examples that would
> be helpful?
The functools library has a function, called wraps, that makes sure
any decorated function maintains its original name and docstring. You
use it inside your decorator functions, like so:
from functools import wraps
def decorator(func):
@wraps(func)
def new_func(*args, **kwargs):
#do some stuff
return new_func
@decorator
def wrapped_func(a, b):
"""this docstring will be saved, and if the function crashes, it
will show up as 'wrapped_func' in your tracebacks"""
# do some other stuff
HTH,
Hugo
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