Ben Finney wrote: > Peter Otten <[EMAIL PROTECTED]> writes: > >> The problem is the structure of your program. The myset module is >> imported twice by Python, once as "myset" and once as "__main__". > > Yes, this is the problem. Each module imports the other. > >> Therefore you get two distinct MySet classes, and consequently two >> distinct MySet.__instance class attributes. > > Are you sure? This goes against my understanding: that 'import foo' > will not re-import a module that's already been imported, but will > instead simply return the existing module.
The main script is put into the sys.modules cache as "__main__", not under the script's name. Therefore the cache lookup fails. > So, I think if one evaluated 'myset is __main__', you'd find they are > exactly the same module under different names; and therefore that > there is only *one* instance of 'MySet', again under two names. No: $ cat tmp.py import tmp import __main__ print tmp is __main__ $ python tmp.py False False Peter -- http://mail.python.org/mailman/listinfo/python-list
