Sort of hard to explain, but if you put another:
list = configuration.items("core")
print list
at the end of the script, you will find that the original config hasn't
been changed.
It is a quirk of how the items() method is implemented using 'yield'
that means that
you see what you do.
In particular to use 'yield' it it necessary to create a temporary
dictionary which
contains the key/value pairs from that section of the config and then
overlay it
with the user supplied vars. Ie., the items() code has:
. d = self._defaults.copy()
. try:
. d.update(self._sections[section])
. except KeyError:
. if section != DEFAULTSECT:
. raise NoSectionError(section)
. # Update with the entry specific variables
. if vars:
. d.update(vars)
See the last line, that will replace the value of 'xyzzy' with that
passed in
as argument to items().
To avoid this, you need to write something like:
. list = []
. for key in configuration.options("core"):
. list.append((key,configuration.get("core",substitution))
. print list
This cause me problems for a different reason, ie., that user vars keys
appear in what items() returns. I avoid using items() for this reason.
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