13

Our framework requires wrapping certain functions in some ugly boilerplate code:

def prefix_myname_suffix(obj):
    def actual():
        print 'hello world'
    obj.register(actual)
    return obj

I figured this might be simplified with a decorator:

@register
def myname():
    print 'hello world'

However, that turned out to be rather tricky, mainly because the framework looks for a certain pattern of function names at module level.

I've tried the following within the decorator, to no avail:

current_module = __import__(__name__)
new_name = prefix + func.__name__ + suffix
# method A
current_module[new_name] = func
# method B
func.__name__ = new_name
current_module += func

Any help would be appreciated!

AnC
  • 4,099
  • 8
  • 43
  • 69
  • 1
    You need to explain what and how the framework "looks" for in these names a little more thoroughly. You can probably override __getattr__ or swizzle your module's own dictionary to fake it out, but it's impossible to say for certain at this point. – Azeem.Butt Oct 25 '09 at 16:55
  • I honestly don't know what exactly the framework does. Oren's little reminder was what I needed. – AnC Oct 25 '09 at 17:03

2 Answers2

23

use either 

current_module.new_name = func

or 

setattr(current_module, new_name, func)
Oren S
  • 1,820
  • 1
  • 19
  • 33
0

It seems the solution to your problem would be to make the decorated function act as the original function.

Try using the function mergeFunctionMetadata from Twisted, found here: twisted/python/util.py

It makes your decorated function act as the original, hopefully making the framework pick it up.

mthurlin
  • 26,247
  • 4
  • 39
  • 46
  • Thanks, that looks interesting - will have to look into how best to apply this. – AnC Oct 26 '09 at 17:51
  • moved https://github.com/racker/python-twisted-core/blob/master/twisted/python/util.py#L805 –  Jan 12 '20 at 09:02