pyton | Python Fiddle

from sys import exit

def welcome():
    hi = ("""
    "Welcome to the first rpg game!"
    Before we start I need you to use your
    0 - quit
    1 - Strength
    2 - HP
    3 - Wisdom
    4 - Agility
    """)
    print(hi)

def remaining_points_screen():
    rem_points = total
    print('you have', rem_points, 'points left\n')

def return_screen():
    back = input("""To return to the selection screen type return\n
    to quit press 0\n""")
    while True:
      if back == "0":
          print('chop-chop')
          exit()
      elif back == "return":
          welcome()
          remaining_points_screen()
          break

def points_conditions():
    if add > 30:
      print('Pardon my friend, but grow a beard, go to the forest and earn these points')
    elif add == 30:
      sure = input("Are you sure that you want to use all your points for this attribute?\n")
      if sure == "yes":
        print('You have:', total,'points left')
        return_screen()
      elif sure == "no":
        return_screen()
    elif add > points:
      print('I am sorry but you do not have that many points left')
      return_screen()

welcome()
while True:
    points = 30
    strength = 0
    hp = 0
    wisdom = 0
    agility = 0
    choice = input('choose:\n')
    if choice == "0":
      exit()
    if choice == "1":
      add = int(input("How many Strength points do you want to add?\n"))
      total = points - int(add)
      strength =+ add
      points =- add
      print('you have', strength,'strength points\n')
      print('you have', total,'points left')
      return_screen()
    elif choice == "2":
      add = int(input("How many HP points do you want to add?\n"))
      total = points - int(add)
      points =- add
      HP =+ add
      print('you have', HP,'HP points')
      print('you have', total,'points left')
      return_screen()
    else:
      print('chop-chop')
      exit()

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