This is a two player dice game where two players each roll two dice. If a player's dice sum is even, they gain 10 points. If the dice total is odd, they lose 5 points.

import random

import time

import sys





print("*****************Welcome To The DICE Game*******************")

abc=input("please type in 'n' if your are a new user type 'e' if you are a existing user: ")

while abc not in ('e','n'):

    abc=input("please type in 'n' if your are a new user type 'e' if you are a existing user: ")







if abc =="n":

    print("make an account")

    username=input("type in a username: ")

    password1=input("type in a pasword: ")

    password2=input("renter the password: ")

    if password1==password2:

        print("your password is",password1)

        f = open ("username + password.txt","a+")

        f.write(f"{username}:{password2}n")

        f.close()

        abc=input("please type in 'n' if your are a new user type 'e' if you are a existing user: ")

    else:

        print("the password you entered is not matching restart the program to start again")

        sys.exit()



if abc == "e":

    check = True

    while check:

        print("player 1 enter your details")

        username1=input("Username = ")

        password=input("Password = ")

        with open("username + password.txt","r") as username_finder:

            for line in username_finder:

                if(username1 + ":" + password) == line.strip():

                    print("you are logged in")

                    print("player 2 enter your details")

                    while check:

                        print("incoreect password or username please try again")

                        username2=input("Username = ")

                        password=input("Password = ")

                        with open("username + password.txt","r") as username_finder:

                            for line in username_finder:

                                if(username2 + ":" + password) == line.strip():

                                    check = False



                                    print("you are logged on")



                                    #game

                                    player1=0

                                    player2=0

                                    print("*****************Welcome To The DICE Game*******************")





                                    print("PLAYER 1 READY")

                                    time.sleep(1)

                                    print("PLAYER 2 READY") 



                                    totalscore1=0

                                    totalscore2=0







                                    #player 1



                                    dice1 = random.randint(1,6)

                                    dice2 = random.randint(1,6)

                                    roundno = 1

                                    while roundno < 5:

                                        totalscore1=totalscore1+player1

                                        totalscore2=totalscore2+player2

                                        player1=dice1+dice2

                                        roundno=roundno+1

                                        print("round",roundno)

                                        time.sleep(1)

                                        print("-----------------------------------------------------")

                                        asdf = input("player 1, press enter to roll")

                                        print("player 1 is rolling")

                                        print("player 1's first roll is",dice1)

                                        time.sleep(1)

                                        print("player 1's second roll is",dice2)

                                        time.sleep(1)

                                        print("-----------------------------------------------------")

                                        if player1 %2==0:

                                            print("This is an even number. so +10 points")

                                            time.sleep(1)

                                            player1=player1+10

                                            time.sleep(1)

                                            print("score is",player1)

                                            if player1<= 0:

                                                print("you have lost the game")

                                                sys.exit()

                                            print("-----------------------------------------------------")



                                        else:

                                            print("This is an odd number.")

                                            time.sleep(2)

                                            player1=player1-5

                                            print("score is",player1)

                                            time.sleep(3)

                                            print("player 1 score",player1)

                                            print("-----------------------------------------------------")







                                        time.sleep(1)

                                        #player 2

                                        dice1 = random.randint(1,6)

                                        dice2 = random.randint(1,6)

                                        totalscore1=totalscore1+player1

                                        totalscore2=totalscore2+player2

                                        player2=dice1+dice2

                                        print("-----------------------------------------------------")

                                        asdf = input("player 2 press enter to roll")



                                        print("player 2 is rolling")

                                        time.sleep(1)

                                        print("player 2's first roll is",dice1)

                                        time.sleep(1)

                                        asdf = input("player 2 press enter to roll again")

                                        time.sleep(1)

                                        print("player 2's second roll is",dice2)

                                        time.sleep(1)

                                        print("-----------------------------------------------------")



                                        if player2 %2==0:

                                            print("This is an even number. so +10 points")

                                            time.sleep(1)

                                            player2=player2+10

                                            print("score is",player2)

                                            time.sleep(1)

                                            if player2<= 0:

                                                print("you have lost the game")

                                                sys.exit()

                                            print("-----------------------------------------------------")



                                        else:

                                            print("This is an odd number.")

                                            time.sleep(1)

                                            player2=player2-5

                                            print("score is",player2)

                                            time.sleep(3)

                                            print("player 2 score",player2)

                                            print("-----------------------------------------------------")



                                    print("the total score for player 1 is ",totalscore1)

                                    print("the total score for player 2 is ",totalscore2)

                                    if totalscore1 > totalscore2:

                                        print("player 1 wins")

                                        file = open("scores.txt2","a+")

                                        file.write("player 1 ")

                                        file.write(username1)

                                        file.write(" has won overall with ")

                                        file.write(str(totalscore1))

                                        file.write(" points")

                                        file.write("n")



                                    if totalscore2 > totalscore1:

                                        print("player 2 wins")

                                        file = open("scores.txt2","a+")

                                        file.write("player 2 ")

                                        file.write(username2)

                                        file.write(" has won overall with ")

                                        file.write(str(totalscore2))

                                        file.write(" points")

                                        file.write("n")     







                                else:

                                    print("incorrect username or password")



                else:

                    print("incorrect username or password")

This only addresses one aspect of your code, but I think it's an important point to communicate:

Login systems

If you ever actually need a login system, you should investigate cybersecurity and good practices in more depth. Generally, it's advisable to use an existing reputable library or API to accomplish such a task, since it's easy to make mistakes in your own implementation.

Having said that, there are a few things that are easy for me to notice in your code:

• Use getpass.getpass to prompt the password so others cannot see the entered password.


• You should never save passwords in plaintext. Hashing and salting are standard security measures employed in all well-implemented password systems.


• Some other things I mentioned in my comment: it would probably be better to lock-out after too many wrong attempts to prevent brute force attacks, and it should probably prevent registration passwords that have identical hashes to those released in common password data dumps. But these are even more outside of the scope of this question's implicit context.

Of course as @jpmc mentions, this is somewhat less relevant for this particular program, since it stores the password locally. But in general, I think starting to consider the security implications of your implementation is important, even if it's just practice.

FUNCTIONS!

Divide your code into functions to make it more readable. In a couple of places, your code is 12 levels of indentation deep! That's the equivalent of 48 characters!

Spacing

Operators should usually have a space on either side.

with

The best way of opening files is as follows (to make sure it get closed even if there is an error):

with open(...) as f:

    ...

My modified version is available on repl.it.