users = {"Tester1" : "Test"}

#Authetication of Players
valid = False
while not valid:
  username = input("Please enter your username: ")
  if username in users.keys():
    valid = True
  else:
    print("Username incorrect!")

valid = False
while not valid:
  password = input("Please enter your password: ")
  if password == users[username]:
    valid = True
    print("Access granted.")
    print("-----------------------------")
  else:
    print("Password incorrect!")