traitlets python3 性能 - Int() 和 Unicode()答案

【问题标题】：traitlets python3 performance - Int() and Unicode()traitlets python3 性能 - Int() 和 Unicode()
【发布时间】：2022-10-01 09:16:05
【问题描述】：

在 python 3.9 下使用traitlets.Int() 和traitlets.Unicode() 对性能有何影响？

标签： python performance python-traitlets

【解决方案1】：

traitlets.Int() 和 traitlets.Unicode() 的性能比 Python 3.9.14 标准库慢了大约 25 倍。

$ python -V
Python 3.9.14
$
$ uname -a
Darwin WS-T604GF3GK0.tld 21.6.0 Darwin Kernel Version 21.6.0: Wed Aug 10 14:28:23 PDT 2022; root:xnu-8020.141.5~2/RELEASE_ARM64_T6000 x86_64
$
$ python traitlets_test.py
After traitlets initialization, traitlets Unicode() was 24.0261 times slower than python stdlib
After traitlets initialization, traitlets Int() was 26.2789 times slower than python stdlib
$

如果有人想看看我曾经测试过的东西，这就是脚本......

# filename: traitlets_test.py

from timeit import timeit
import sys

from traitlets import HasTraits, Int, Unicode

###############################################
# Define traitlets tests here
###############################################

class MyTraitTester(HasTraits):
    """
    Initialize a HasTraits() class instance and define static
    types for foo_int and foo_unicode.
    """
    foo_int = Int()
    foo_unicode = Unicode()

def with_traits_int():
    harness.foo_int = 5
    return harness.foo_int

def with_traits_unicode():
    harness.foo_unicode = "5555555555555555555555555555555555555555555555555555"
    return harness.foo_unicode

###############################################
# Define python stdlib tests here...
###############################################

def without_traits_int():
    foo_int = 5
    return foo_int

def without_traits_unicode():
    foo_unicode = "5555555555555555555555555555555555555555555555555555"
    return foo_unicode

if __name__=="__main__":
    # Initialize traitlets here... `traitlets.HasTraits()` looks very slow... I will not test performance with it.
    harness = MyTraitTester()

    time_with_traits = timeit("with_traits_unicode()", setup="from __main__ import with_traits_unicode", number=1000000)
    time_without_traits = timeit("without_traits_unicode()", setup="from __main__ import without_traits_unicode", number=1000000)
    print("After traitlets initialization, traitlets Unicode() was {} times slower than python stdlib".format(round(time_with_traits/time_without_traits, 4)))

    time_with_traits = timeit("with_traits_int()", setup="from __main__ import with_traits_int", number=1000000)
    time_without_traits = timeit("without_traits_int()", setup="from __main__ import without_traits_int", number=1000000)
    print("After traitlets initialization, traitlets Int() was {} times slower than python stdlib".format(round(time_with_traits/time_without_traits, 4)))

【讨论】：