Define python functions at runtime

Question

I want to create python functions on the go, with the following template:

def x(sender,data):
 r=b'' 
 r+=sender.send_type0(data[0])
 r+=sender.send_type1(data[1])
 r+=sender.send_type2(data[2])
 ...
 r+=sender.send_typen(data[n])
 return r

I want to create many of those functions from an array which holds type data as a 2D array. I can generate simple functions at runtime, but there I would like to run a for-statement only at the generation, and not at every call of the function. How can I achieve this?

• Paul Rooney: Can you give more details. What type is sender? How can a byte string become a function? I'm not following your example.

Answer 1

You could use getattr to dynamically type out the attribute...

def x(sender,data):
 return b"".join(
 getattr(sender, "send_type"+i)(data[i])
 for i in xrange(len(data))
 )

I don't think you're going to find much of a performance advantage in having the function precompiled, assuming that is even possible...

• Uncle Dino: So there's no fancy solution to do what I want. I' disappointed in Python... :D
• Shadow: What language actually supports this out of interest? And what advantage does it have over my solution of just doing it dynamically?