Question

So I have some code that is being somewhat troublesome to rewrite:

def func_A():

    x=[]
    # the function picks random members of the local x and rearranges them,
    # after giving x some initial value
    return x

Now I want to create an iteration in a func_B such that, for each run-through in an interation, func_B uses the x value that func_A generates to do things.

However, I want to avoid making x a global variable.

My first thought was to make the first line of the def of func_B x=func_A(), but this would run the randomizer twice and the value of x would be changed.

How do I reference the same x that func_A produces in func_B without running the randomizer again (until the next iteration in func_B) and without using global variables?

Answer 1

Use Classes

import random
class Randomizer():
    def __init__(self):
        # Generates a list of random values
        self.x = []
        self.rng = 10
        for i in range(1,self.rng+1):
            self.x.append(random.random())            

        # Need to call once to make sure all vars defined
        self.func_A()

    # pick a random value from a list
    def func_A(self):
        self.recent = self.x[random.randint(0,self.rng-1)]
        return self.recent

    # Do something with random value picked by A
    def func_B(self):
        return self.recent*self.recent

Think this is what you meant?

>>> r = Randomizer()
>>> r.func_A()
0.91223345147715629
>>> r.func_B()
0.83216986999392528