Python数学库独立于C数学库和平*立？

Does the built-in Python math library basically use C's math library or does Python have a C-independent math library? Also, is the Python math library platform independent?

内置的Python数学库基本上是使用C的数学库吗?还是Python有一个独立于C的数学库?此外,Python数学库平台是独立的吗?

2 个解决方案

#1

at the bottom of the page it says:

在页面底部它说:

Note: The math module consists mostly of thin wrappers around the platform C math library functions. Behavior in exceptional cases is loosely specified by the C standards, and Python inherits much of its math-function error-reporting behavior from the platform C implementation. As a result, the specific exceptions raised in error cases (and even whether some arguments are considered to be exceptional at all) are not defined in any useful cross-platform or cross-release way. For example, whether math.log(0) returns -Inf or raises ValueError or OverflowError isn’t defined, and in cases where math.log(0) raises OverflowError, math.log(0L) may raise ValueError instead.

注意:math模块主要包含围绕平台C数学库函数的瘦包装器。特殊情况下的行为由C标准松散地指定,并且Python从平台C实现继承了其大部分数学函数错误报告行为。因此,在错误情况下引发的特定异常(甚至某些参数被认为是特殊的)都没有以任何有用的跨平台或交叉发布方式定义。例如,math.log(0)是否返回-Inf或引发ValueError或OverflowError未定义,并且在math.log(0)引发OverflowError的情况下,math.log(0L)可能会引发ValueError。

All functions return a quiet NaN if at least one of the args is NaN. Signaling NaNs raise an exception. The exception type still depends on the platform and libm implementation. It’s usually ValueError for EDOM and OverflowError for errno ERANGE.

如果至少有一个参数是NaN,则所有函数都返回一个安静的NaN。信令NaNs引发异常。异常类型仍取决于平台和libm实现。它通常是EDOM的ValueError和errno ERANGE的OverflowError。

Changed in version 2.6: In earlier versions of Python the outcome of an operation with NaN as input depended on platform and libm implementation.

版本2.6中更改:在早期版本的Python中,使用NaN作为输入的操作的结果取决于平台和libm实现。

#2

Python uses the C library it is linked against. On Windows, there is no 'platform C library'.. and indeed there are multiple versions of MicrosoftCRunTimeLibrarys (MSCRTs) around on any version.

Python使用它链接的C库。在Windows上,没有'平台C库'..并且确实在任何版本上都有多个版本的MicrosoftCRunTimeLibrarys(MSCRT)。

#1