decorating functions with generic signatures (not for the faint of heart)

[Thomas Heller]

"Michele Simionato" <michele.simionato at gmail.com> writes:

> I have realized today that defining decorators for functions
> with generic signatures is pretty non-trivial.

I've not completely read your post ;-), but I assume you're trying to do
something that I've also done some time ago. Maybe the following code
snippet is useful for you - it creates a source code string which can
than be compiled.

The code prints this when run:

"""
def f(a, b=42, c='spam', d=None):
    'docstring'
    return f._api_(a, b, c, d)
def g(*args, **kw):
    ''
    return g._api_(*args, **kw)
"""

Thomas

<code>
def make_codestring(func):
    import inspect
    args, varargs, varkw, defaults = inspect.getargspec(func)
    return "def %s%s:\n    %r\n    return %s._api_%s" % \
           (func.func_name,
            inspect.formatargspec(args, varargs, varkw, defaults),
            func.func_doc or "",
            func.func_name,
            inspect.formatargspec(args, varargs, varkw))

def f(a, b=42, c="spam", d=None):
    "docstring"

def g(*args, **kw):
    pass

print make_codestring(f)
print make_codestring(g)
</code>