slicing the end of a string in a list

[Paul Rubin]

[line.rstrip() for line in open('C:\\switches.txt')]

How would I manually close a file that's been opened this way? Or is
it not possible in this case? Is it necessary?

In CPython it's not strictly necessary to close the file, but other
implementations don't guarantee that a file will be closed after the
last reference is deleted.

So for fullest portability it's better explicitly close the file.

I wonder whether PEP 343 should be extended somehow. Hmm.

[line.rstrip() for line within open('C:\\switches.txt')] # ugh!!

Other ideas?