How to pass a function as a function parameter in Python

Question

This is what I currently have and it works fine:

def iterate(seed, num):
    x = seed
    orbit = [x]
    for i in ran         


        

Answer 1

Functions are first-class citizens in Python. you can pass a function as a parameter:

def iterate(seed, num, fct):
#                      ^^^
    x = seed
    orbit = [x]
    for i in range(num):
        x = fct(x)
        #   ^^^
        orbit.append(x)
    return orbit

In your code, you will pass the function you need as the third argument:

def f(x):
    return 2*x*(1-x)

iterate(seed, num, f)
#                  ^

Or

def g(x):
    return 3*x*(2-x)

iterate(seed, num, g)
#                  ^

Or ...

---

If you don't want to name a new function each time, you will have the option to pass an anonymous function (i.e.: lambda) instead:

iterate(seed, num, lambda x: 3*x*(4-x))