bpo-43785: Improve BZ2File performance #25299
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* Remove `RLock` from `BZ2File`. It makes `BZ2File` to thread unsafe, but gzip and lzma don't use it too. * Added `BZ2File.__iter__()` method which delegate to `self._buffer.__iter__()`. It is much faster than calling `BZ2File.readline()` for each lines.
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https://bugs.python.org/issue43785