On 04.12.15 00:26, Oscar Benjamin wrote:
On 3 Dec 2015 16:50, "Terry Reedy" <tjre...@udel.edu> wrote:
fileinput is an ancient module that predates iterators (and generators)
and context managers. Since by 2.7 open files are both context managers and
line iterators, you can easily write your own multi-file line iteration
that does exactly what you want. At minimum:
for file in files:
with codecs.open(file, errors='ignore') as f
# did not look up signature,
for line in f:
do_stuff(line)
The above is fine but...
To make this reusable, wrap in 'def filelines(files):' and replace
'do_stuff(line)' with 'yield line'.
That doesn't work entirely correctly as you end up yielding from inside a
with statement. If the user of your generator function doesn't fully
consume the generator then whichever file is currently open is not
guaranteed to be closed.
You can convert the generator to context manager and use it in the with
statement to guarantee closing.
with contextlib.closing(filelines(files)) as f:
for line in f:
...
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