如何讓子類調用__init__方法

Question

我有下面的類：

import cfg 
import sqlite3 
import logging 

# logger = logging ...... 

class Connection: 
    def __init__(self): 
     try: 
      self.connection = sqlite3.connect(cfg.pathToDatabase) 
      self.connection.row_factory = sqlite3.Row 
      self.cursor = self.connection.cursor() 
      logger.info("Connection to database at " + cfg.pathToDatabase + " successful") 
     except Exception, e: 
      logger.critical("Error connecting to database") 
      logger.exception(e) 

該類將從多個類實例化。在下面一行：

logger.info("Connection to database at " + cfg.pathToDatabase + " successful") 

我想日誌的類稱爲在連接類__ __的init方法。這可能嗎 ？

例如，基於以下幾點：

class Child: 
    def __init__(self): 
     self.connection = Connection() 

我希望看到這個記錄：

"Connection to database at data.sqlite successful from class: Child" 

Answer 1

像這樣的事情？

import traceback, sys 

class C: 
    def __init__(self): 
     try: 
      raise StopIteration 
     except StopIteration: 
      tb = sys.exc_info()[2] 
      stack = traceback.extract_stack(tb.tb_frame) 
      f = stack[-2] 
      print "I was called from %s %s (%s:%s)" % (f[2], f[3], f[0], f[1]) 

class A: 
    def __init__(self): 
     self.c = C() 

def foo(): 
    A() 
    return C() 

def main(): 
    C() 
    foo() 

if __name__ == '__main__': 
    main() 

輸出：「它是不好的做法，用一個類來表示以這種方式與數據庫的連接」

I was called from main C() (test.py:22) 
I was called from __init__ self.c = C() (test.py:15) 
I was called from foo return C() (test.py:19)