[PythonWin] MakePy and gencache.Ensure Module() do different things.

[Paul Keating]

I used MakePy to generate .py support for a COM dll. That created the
file

30D58DAF-B538-45F1-8EFF-F69ABA2BA798x0x 1x13.py

I want to be sure that this file is present and so I used MakePy -i to
construct a call to gencache.Ensure Module().

This is what it said:

{30D58DAF-B538-45F1-8EFF-F69ABA2BA798}, lcid=0, major=1, minor=13

# Use these commands in Python code to auto generate .py support
from win32com.client import gencache
gencache.Ensure Module('{30D58D AF-B538-45F1-8EFF-F69ABA2BA798}',

0, 1, 13)

But when I execute this code, it creates the support as a package,
that is, there is a _folder_ called

30D58DAF-B538-45F1-8EFF-F69ABA2BA798x0x 1x19

(NB minor version is 19 not 13) with separate .py files for each
interface and class inside, and an __init__.py.

If the EnsureModule() call has not been called to generate the
package, then win32com.client .CastTo() fails when called with a
class-instance and interface defined in the COM dll. It complains that
it can't find the package ...x19.

Can anyone explain the version number difference (I realize that
19=0x13 but that doesn't help me understand it much), the
package/single file difference, and why Dispatch responds to the one,
but CastTo expects the other?