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(GH-11859)
Escape ``\r``, ``\0`` and ``\x1a`` (end-of-file on Windows) in Unicode strings.
(cherry picked from commit 38ab7d4721b422547f7b46b9d68968863fa70573)
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
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The picklers do no longer allocate temporary memory when dumping large
bytes and str objects into a file object. Instead the data is
directly streamed into the underlying file object.
Previously the C implementation would buffer all content and issue a
single call to file.write() at the end of the dump. With protocol 4
this behavior has changed to issue one call to file.write() per frame.
The Python pickler with protocol 4 now dumps each frame content as a
memoryview to an IOBytes instance that is never reused and the
memoryview is no longer released after the call to write. This makes it
possible for the file object to delay access to the memoryview of
previous frames without forcing any additional memory copy as was
already possible with the C pickler.
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This hides unwanted implementation details from tracebacks.
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method when unpickle collections.deque and other list-like objects.
This can speed up unpickling to 2 times.
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Original patch by Alexandre Vassalotti.
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Original patch by Alexandre Vassalotti.
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Most fixes to Doc/ and Lib/ directories by Ville Skyttä.
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This changes the main documentation, doc strings, source code comments, and a
couple error messages in the test suite. In some cases the word was removed
or edited some other way to fix the grammar.
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can now be pickled using pickle protocols older than protocol version 4.
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unpickler. Highest 32 bits of 64-bit size for BINUNICODE8 and BINBYTES8
opcodes no longer silently ignored on 32-bit platforms in C implementation.
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unpickler. Highest 32 bits of 64-bit size for BINUNICODE8 and BINBYTES8
opcodes no longer silently ignored on 32-bit platforms in C implementation.
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or nested classes) now are supported with pickle protocols < 4.
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Fixed ambigious reverse mappings. Added many new mappings. Import mapping
is no longer applied to modules already mapped with full name mapping.
Added tests for compatible pickling and unpickling and for consistency of
_compat_pickle mappings.
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mutated while iterating.
Patch by Olivier Grisel.
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Initial patch by Merlijn van Deen.
I've added a few unrelated docstring fixes in the patch while I was at
it, which makes the documentation for pickle a bit more consistent.
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This will allow us to control in the future whether to use framing or not.
For example, we may want to turn it off for tiny pickle where it doesn't
help.
The change also improves performance slightly:
### fastpickle ###
Min: 0.608517 -> 0.557358: 1.09x faster
Avg: 0.798892 -> 0.694738: 1.15x faster
Significant (t=3.45)
Stddev: 0.17145 -> 0.12704: 1.3496x smaller
Timeline: http://goo.gl/3xQE1J
### pickle_dict ###
Min: 0.669920 -> 0.615271: 1.09x faster
Avg: 0.733633 -> 0.645058: 1.14x faster
Significant (t=5.05)
Stddev: 0.12041 -> 0.02961: 4.0662x smaller
Timeline: http://goo.gl/LpLSXI
### pickle_list ###
Min: 0.397583 -> 0.368112: 1.08x faster
Avg: 0.412784 -> 0.397223: 1.04x faster
Significant (t=2.78)
Stddev: 0.01518 -> 0.03653: 2.4068x larger
Timeline: http://goo.gl/v39E59
### unpickle_list ###
Min: 0.692935 -> 0.594870: 1.16x faster
Avg: 0.730012 -> 0.628395: 1.16x faster
Significant (t=17.76)
Stddev: 0.02720 -> 0.02995: 1.1012x larger
Timeline: http://goo.gl/2P9AEt
The following not significant results are hidden, use -v to show them:
fastunpickle.
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Most of the work is by Alexandre.
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error messages and comments.
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error messages and comments.
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ModuleNotFoundError.
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to correctly process the opcode when it is used on non-list objects.
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The C version tried to remove trailing whitespace between the last quote and
the newline character. I am not sure why it had this because pickle never
generated such pickles---for this to happen repr(some_string) would need to
return trailing whitespace. It was maybe there to make it easier for people
to write pickles in text editors. Anyhow, the Python version doesn't do this
so there is no point keeping this around anymore.
Also, I've changed the exception raised when a bad pickle is encountered.
Again this unlikely to make much difference to anyone though it does make
testing slightly nicer for us.
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lengths as unsigned 32-bit integers, like the C implementation does.
Patch by Serhiy Storchaka.
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lengths as unsigned 32-bit integers, like the C implementation does.
Patch by Serhiy Storchaka.
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Thanks for James Sanders for the bug report and the patch.
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attribute which allows to set custom per-pickler reduction functions.
Patch by sbt.
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Initial patch by sbt.
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