Possible to change a function’s repr in python?

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Yes, if you’re willing to forgo the function actually being a function.

First, define a class for our new type:

import functools
class reprwrapper(object):
    def __init__(self, repr, func):
        self._repr = repr
        self._func = func
        functools.update_wrapper(self, func)
    def __call__(self, *args, **kw):
        return self._func(*args, **kw)
    def __repr__(self):
        return self._repr(self._func)

Add in a decorator function:

def withrepr(reprfun):
    def _wrap(func):
        return reprwrapper(reprfun, func)
    return _wrap

And now we can define the repr along with the function:

@withrepr(lambda x: "<Func: %s>" % x.__name__)
def mul42(y):
    return y*42

Now repr(mul42) produces '<Func: mul42>'

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