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什么是__init__.py一个Python源目录？

我正在编写一个有趣的Python程序但是试图从另一个文件中的类导入函数时遇到困难.这是我的代码:

#jurassic park mainframe

from random import randint
from sys import exit
from comm_system import Comm_system #the file i want to import from



class Jpark_mainframe(object):
    def mainframe_home(self):
        print "=====Welcome to the Jurassic Park Mainframe====="
        print "==========Security Administration==============="
        print "===========Communications Systems==============="
        print "===============System Settings=================="
        print "===================Quit========================="

        prompt = raw_input("What would you like to do? ")

        while prompt != "Quit":

            if prompt == "Security Administration":
                print "Please enter the 5-digit passcode:"
                security_passcode = "%d%d%d%d%d" % (2, 0, 1, 2, randint(1, 2))
                security_guess …