Vfrdtyky

I have recently finished a project and I now wish to split up the program into multiple files to improve readability and future improvements to it, however I do not know how to do this. I have split up all functions to do with a certain subject into their own files (database files in a database file, hashing files into hashing, etc etc)

edit: I believe the correct term is "modules" (the 'files' I'm trying to split my program into, so sorry about the lack of correct terminology)

To do this I have done "from foo import *" which I know is bad practice, but in my editor pycharm it does not show any immediate errors unlike doing "import foo".

However, when I run the program, I get errors saying a file I imported is using an undefined variable (which is defined in the main program)
Here is a snippet of the code:

from Data_Funcs import *

if __name__ == "__main__":

    DBSetup()

    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

    s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

    s.bind((host, port))

    s.listen(1)

    while True:

        conn, addr = s.accept()

        connThread = Thread(target=handler, args=(conn, addr))

        connThread.daemon = True

        connThread.start()

Here is Data_Funcs:

def receiveData(FROM=""):

    print("In receive data")

    if FROM:

        print("From:", FROM)

    # sendPickledData(dataReady)

    dataString = conn.recv(4096)

    try:

        dataString = pickle.loads(dataString)

    except pickle.UnpicklingError as err:

        print("Pickling error:")

        print(err)

    time.sleep(0.2)

    print("Data received:")

    print(dataString)

    return dataString





def sendPickledData(data):

    print("In sendPickled,nSending:",data)

    data = pickle.dumps(data)

    conn.sendall(data)

    time.sleep(0.2)

However when I run the program, I get the error:

  File "C:UsersGreenAppDataLocalProgramsPythonPython36libthreading.py", line 916, in _bootstrap_inner

    self.run()

  File "C:UsersGreenAppDataLocalProgramsPythonPython36libthreading.py", line 864, in run

    self._target(*self._args, **self._kwargs)

  File "C:/Users/Green/Desktop/Py Proj/Project_Server_Handler_v5.py", line 200, in handler

    data = receiveData("handler")

  File "C:UsersGreenDesktopPy ProjData_Funcs.py", line 7, in receiveData

    dataString = conn.recv(4096)

NameError: name 'conn' is not defined

Despite the variable conn being defined in the "if name == 'main':" part of the main program