CODEWITHSUNDEEP
python-3.x
ibexy
ibexy

Reputation: 611

Parameterize function name in Python

I have a generic function for which I would like the name to change based on the value of predefined variable. Not sure this is possible in Python:

n = 'abc'
def f{n}(x):
  print(x)
  
f{n}(3)

In the above, the function name will end up becoming "fabc"?

Upvotes: 2

Views: 449

Answers (2)

oskros
oskros

Reputation: 3285

You could do it with something like the below:

def f(n):    
    exec(f"def f{n}(x): print(x)") 
    return eval(f"f{n}")

Upvotes: 0

wim
wim

Reputation: 362557

It is possible using a code-generation + exec pattern. It is also possible by instantiating a types.FunctionType instance directly. But a much simpler solution would be to leave the generic name, and then inject an alias (another reference to the same function object) for the dynamic name into whichever namespace you want.

>>> def generic_function(x):
...     print(x ** 2)
... 
>>> dynamic_name = "func_abc"
>>> globals()[dynamic_name] = generic_function
>>> func_abc(3)
9

To inject in some other module namespace that would be a setattr call:

setattr(other_mod, dynamic_name, generic_function)

You could also rewrite the function's __name__ attribute if you wanted to, but there's probably not much point.

Upvotes: 2

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