[Zope] upload file from filename

[John Hunter]

>From a Python Script, given a string which is a filename on the local
filesystem, say,

    thisFile = 'C:\\ProgramFiles\\SomeDir\\somefile.dat'

How can I upload this to the zope filesystem?

I naively tried:

    folder.manage_addFile(id='somefile.dat', file=thisFile )

But of course this created a file somefile.dat with contents
'somefile.dat' because the 'file' argument contains the content, not
the name, of the file.

Any suggestions?
Thanks,
John Hunter