[Zope] need help importing python class into zope 2.11.2

HI I'm new to zope and python, I wrote some basic python class and a test program using this class. The script is working fine when running python from command line. Now I want to uses this class inside zope, I tried to create the script, but it failed with the following error. Line 5: "__init__" is an invalid variable name because it starts with "_" Can I write a constructor with different name? Please advice what is the correct why to import this class to zope Thanks Dganit