[Python] Problems with the logic for checking answer in Code Breaker / Mastermind board game

I'm trying to make the game Mastermind with python, I want to give the user a green X for every correct number and position of number, a yellow X for right number but wrong position and a gray X for neither. However I cant figure out the logic, especially when there are 2 identical numbers.

This is how far I've gotten but no matter what i try it doesnt work out in my head.

import random

class game():

def __init__(self):

self.solvednumberlist = list()
self.correctamount = 0
self.semicorrectamount = 0
self.checklist = list()

for i in range(4):

self.numgen = str(random.randint(0,9))

self.solvednumberlist.insert(i-1, self.numgen)

self.solvednumber = "".join(self.solvednumberlist)


print(self.solvednumber)


def userinput(self):

self.userin = input("Guess a 4 digit code: ")


def dataprocess(self):

for i in range(4):

print("user", self.userin, i)

for j in range(4):

if self.userin in self.solvednumber[j]:

print("true", self.solvednumber[j], j)

if i==j:

print("green")
self.green = True

else:

print("yellow")
self.green = False

if self.green == True:
print("green")
self.checklist.insert(i, "g")
print(self.checklist)
break
else:
print("no green")

else:

print("false", self.solvednumber[j], j)
print("")

run = game()
run.userinput()
run.dataprocess()

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