Python simple module and class for calculating BMI in inches and pounds + Track player's and team roster's stats.

BMICalculator.py

class Player(object):
  
  # Class Attributes, tracking all players
  players = {}
  id_player_names = {}  # Just something to help you track id to players
  last_id = 0
  
  def __init__(self, name=None, height = 0, weight = 0 , bmi =0):
  
    # Player attributes, tracking a player's stats
    self.name = name
    self.height = height
    self.weight = weight
    self.bmi = bmi
    
    self.player_id = Player.last_id +1
  
  
    # Register the player
    Player.register_player(self.player_id, name, height, weight, bmi)
  
  
  @classmethod
  def register_player(cls, player_id, name, height, weight, bmi):
    
    cls.players.update({player_id:
      {"name":name, "height":height, "weight":weight, "bmi": bmi}
      
    })
    cls.id_player_names.update({player_id:name})
    
    cls.last_id = max(cls.id_player_names, key=int)
    
  @classmethod
  def list_all_players(cls):
    for player_id, name in cls.id_player_names.items():
      print("Player ID: ", player_id, "name: ", name)
      return cls.id_player_names
  
  @classmethod
  def list_all_players_stats(cls):
    for player_id, stats in cls.players.items():
      print("Player ID: ", player_id, stats['name'], "\n", "stats: ", stats, "\n")
    return cls.players
    
  @classmethod
  def update_player(cls, player_id, **kwargs):
    
    cls.players[player_id].update(kwargs)
    
    if "name" in kwargs:
      cls.id_player_names[player_id]=kwargs['name']
    
    #print("player_id: ", player_id, "name: ", cls.id_player_names[player_id], "has been updated")
  
  @classmethod
  def get_player_stats(cls, player_id):
    return cls.players[player_id]
    
  def stats(self):
    return Player.get_player_stats(self.player_id)
    
  
  def get_height(self):
    height = float(input("Please enter player's height in inches: "))
    self.height = height
    Player.update_player(self.player_id, height = height)
    
    return height
    
  def get_weight(self):
    weight = float(input("Please enter player's weight in pounds: "))
    self.weight = weight
    
    Player.update_player(self.player_id, weight = weight)
    
    return weight
  
  @staticmethod
  def calculate_bmi(height, weight):
    
    bmi = round((weight/ height/height) * 703,1)
    
    return bmi
  
  def get_bmi(self):
    if self.height is 0:
      self.get_height()
    if self.weight is 0:
      self.get_weight()
    
    bmi = self.calculate_bmi(self.height, self.weight)
    Player.update_player(self.player_id, bmi = bmi)
    self.bmi = bmi
    
    return self.bmi
  
# Example use case
if __name__ == '__main__':
  players_added = 0
  while True:

    if players_added == 5:
      print("Total roster of players added \n")
      print(Player.list_all_players())
      players_added = 0

    name = input("What is the player's name?: ")
    a_player = Player(name)
    a_player.get_bmi()

    print("Displaying {}'s stats".format(name))
    print(a_player.stats(), "\n")


    print("Listing all player's stats")
    Player.list_all_players_stats()

    players_added +=1