Meaning of warning in repl.it?

I wanted to experiment with != instead of = here (by switching the if and else statements), in case I wanted to add an elif: after (maybe a test-response if entered guess is greater than max). I don't understand why it is now throwing a warning/error, or what that warning means.

To clarify, the code runs and seems to work, but I get a warning in the repl.it I'm using to write/run.

On line 3 def make_guess

It says - Redefining name 'guess' from outer scope (line 21) <=What does this mean?

And then on line 21 max=int(input("Guess number between 1 and what?"))

It says Redefining built-in 'max' [Although I'm guessing this isn't the issue, because if I rename that variable maxi it doesn't show the warning for line 21]

Original code:

import random

def make_guess(guess):
    if guess == randomnumber:
        print()
        print("Congratulations, you guessed my number!")
    else:
        guess = int(input("Guess again?"))
        make_guess(guess)

print("GUESS MY NUMBER")
print()
max = int(input("Guess number between 1 and what?"))

randomnumber = random.randint(1, max)

guess = int(input("What is your best guess?"))
make_guess(guess)


print("My number was", randomnumber)

New code:

import random


def make_guess(guess):
    if randomnumber != guess:
        guess = int(input("Guess again?"))
        make_guess(guess)
    else:
        print()
        print("Congratulations, you guessed my number!")


print("GUESS MY NUMBER")
print()

max = int(input("Guess number between 1 and what?"))

randomnumber = random.randint(1, max)

guess = int(input("What is your best guess?"))
make_guess(guess)

print("My number was", randomnumber)

This particular warning was given by my IDE (in this case repl.it). It was letting me know that I was reusing/redefining a variable (in this case guess) in a different scope (ie within the function) and that this might be an issue.

The second warning was being given because I was using max as a variable name, and max has other uses within python, chiefly as a the max Built-in Function used with lists and other iterables. Redefining max could also be an issue if you actually wanted to use the Built-in function. In this case it is not, but the IDE helpfully warns you, as this isn't an advisable practice.