I know
with open('foo.txt') as f:
...do something...
will close the file automatically when the "with" block ends.
I also saw codes in a book:
for line in open('foo.txt'):
...do something...
but it didn't mention if the file will be closed automatically or not when the
"for" block ends. Is there any document talking about this? and how to know if
a file is in "open" or not?
--Jach Fong
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