[issue20501] fileinput module will read whole file into memory when using fileinput.hook_encoded

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Same as on Linux (and differs from 3.x). Thank you Zachary.

Here is corrected patch. Added also a test which tests that readline() doesn't read whole file.

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Added file: http://bugs.python.org/file34232/fileinput_hook_encoded_3.patch

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