while c == 0:
print ("Please login!")  ## This is indented here, it wont show up here :/
while d == 0:
    usernametest = "";
    usernametest = input("Please enter your username: ")
    if username.strip() != "": ## first user signed up
        if username2.strip() != "": ## 2 users signed up
            if username3.strip() != "": ## 3 users signed up
                if usernametest != username or username2 or username3:
                    print("Username not recognised!")

            else:
                if usernametest == username3: #checking user 3 login
                    print("Username accepted!")
                    passwordtest = input("Please enter your password")
                    if passwordtest != password3:
                        print("Password incorrect, please try again")
                    else:
                        print("Password Accepted!")
                        print("------------------")
                        print("Successfully logged in!")
                        d = 1;
                        c = 1;
                        useaccount = 3;
                        break
                elif usernametest == username2: #checking user 2 login
                    print("Username accepted!")
                    passwordtest = input("Please enter your password: ")
                    if passwordtest != password2:
                        print("Password incorrect, please try again!")
                    else:
                        print("Password Accepted!")
                        print("------------------")
                        print("Successfully logged in!")
                        d = 1;
                        c = 1;
                        useaccount = 2;
                        break
                elif usernametest == username: # checking user 1 login
                     print("Username accepted!")
                     passwordtest = input("Please enter your password: ")
                     if passwordtest != password:
                         print("Password incorrect, please try again!")
                     else:
                         print("Password Accepted!")
                         print("------------------")
                         print("Successfully logged in!")
                         d = 1;
                         c = 1;
                         useaccount = 1;
                         break
            if usernametest != username or username2: #checking user 2 login
                print("Username not recognised!")
            else:
                if usernametest == username2:
                    print("Username accepted!")
                    passwordtest = input("Please enter your password: ")
                    if passwordtest != password2:
                        print("Password incorrect, please try again!")
                    else:
                        print("Password Accepted!")
                        print("------------------")
                        print("Successfully logged in!")
                        d = 1;
                        c = l;
                        useaccount = 2;
                        break
                elif usernametest == username: # checking user 1 login
                     print("Username accepted!")
                     passwordtest = input("Please enter your password: ")
                     if passwordtest != password:
                         print("Password incorrect, please try again!")
                     else:
                         print("Password Accepted!")
                         print("------------------")
                         print("Successfully logged in!")
                         d = 1;
                         c = 1;
                         useaccount = 1;
                         break

        if usernametest != username: # checking user 1 login
            print("Username not recognised!")
        else:
            print("Username accepted!")
            passwordtest = input("Please enter your password: ")
            if passwordtest != password:
                print("Password incorrect, please try again!")
            else:
                print("Password Accepted!")
                print("------------------")
                print("Successfully logged in!")
                d = 1;
                c = 1;
                useaccount = 1;
                break