sql - Python: How can I merge these 2 overloaded constructors into 1 constructor -

i have class called portfolio & right have 2 constructors (although discovered u cant overload functions in python) so have merge these 2 constructors.

i experienced python programmer merging 2 constructors pretty contradictory doing head in! :p

the first constructor:
+ purpose create .db file & initialise class variables
- initialises class member variables
- checks whether file path&name db_path exists: if exit coz dont want overwrite existing database return none
- create database (sql database) & set necessary tables
- import portfolio data (date created, etc)

the 2nd constructor:
+ purpose import stock data existing sql database file & initialise variables
- initialises class member variables
- checks whether file path&name db_path exists: if not exit coz dont want overwrite existing database return none
- call function import stocks database
- import portfolio data (date created, etc)

how can merge these 2 constructors, ugh, why doesn't python allow overloading

class portfolio: """ portfolio class implementation """  # class variables:  # self.db_path # self.app_parent # self.tracking_stocks # self.registered_stocks # self.total_purchase_exp # self.ytd_roi # self.cash_reserve   # class functions:  def __init__( self, _app_parent, _db_path, stock_list ):     """ constructor: """      self.db_path            = _db_path     self.app_parent         = _app_parent     self.tracking_stocks    = []     self.registered_stocks  = []     self.total_purchase_exp = 0     self.ytd_roi            = 0     self.cash_reserve       = 500      if database_exists( self.db_path ):         return none      self.create_database()     self.import_portfolio_data()      stock_data in stock_list:          self.add_stock( stock_data )   def __init__( self, _app_parent, _db_path ):     """ constructor: """      self.db_path            = _db_path     self.app_parent         = _app_parent     self.tracking_stocks    = []     self.registered_stocks  = []     self.total_purchase_exp = 0     self.ytd_roi            = 0     self.cash_reserve       = 500      if not self.database_exists( self.db_path ):         return none      self.import_portfolio_data()     self.import_stocks() 

why have happen in constructors?

you construct object, call separate methods on for importing stock lists, or creating database.

wrapping in builder pattern may suit existing design.