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?

Can you give more details. What type is sender? How can a byte string become a function? I'm not following your example. — Paul Rooney
– Paul Rooney, Commented Dec 22, 2016 at 2:11

Shadow · Accepted Answer · 2016-12-22 02:04:22Z

2

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...

answered Dec 22, 2016 at 2:04

Shadow

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2 Comments

Uncle Dino Over a year ago

So there's no fancy solution to do what I want. I' disappointed in Python... :D

Shadow Over a year ago

What language actually supports this out of interest? And what advantage does it have over my solution of just doing it dynamically?

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