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bpo-23403: Bump pickle.DEFAULT_PROTOCOL to 4 (#6355)

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This makes performance better and produces shorter pickles. This change is backwards compatible up to the oldest currently supported version of Python (3.4).
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Łukasz Langa 2018-04-03 23:06:53 -07:00 • committed by GitHub
parent 42ec190761
commit c51d8c9ba6
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6 changed files with 43 additions and 22 deletions
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10
Lib/pickle.py
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@ -57,9 +57,9 @@ compatible_formats = ["1.0", # Original protocol 0
HIGHEST_PROTOCOL = 4
# The protocol we write by default. May be less than HIGHEST_PROTOCOL.
# We intentionally write a protocol that Python 2.x cannot read;
# there are too many issues with that.
DEFAULT_PROTOCOL = 3
# Only bump this if the oldest still supported version of Python already
# includes it.
DEFAULT_PROTOCOL = 4
class PickleError(Exception):
"""A common base class for the other pickling exceptions."""
@ -376,8 +376,8 @@ class _Pickler:
The optional *protocol* argument tells the pickler to use the
given protocol; supported protocols are 0, 1, 2, 3 and 4. The
default protocol is 3; a backward-incompatible protocol designed
for Python 3.
default protocol is 4. It was introduced in Python 3.4, it is
incompatible with previous versions.
Specifying a negative protocol version selects the highest
protocol version supported. The higher the protocol used, the