在python源代码中的哪个位置定义了math.exp()? [英] Where in the python source code is math.exp() defined?
问题描述
我想知道如何在python中实现math.exp()函数. math.exp()在Python源代码中的何处定义?
I want to known how to implement the math.exp() function in python. Where in the Python source code is math.exp() defined?
推荐答案
这有点棘手.
math模块在C模块 mathmodule.c 中实现.该文件的末尾有一个特定的Python库结构，该结构定义了已实现的 exp通过math_exp :
The math module is implemented in a C module, mathmodule.c. At the end of that file there is a specific Python library structure that defines exp as implemented by math_exp:
static PyMethodDef math_methods[] = {
# ...
{"exp", math_exp, METH_O, math_exp_doc},
但math_exp本身实际上是通过 FUNC1宏，使用 math_1包装函数调用C库exp函数，其中包含一些错误处理和类型转换:
but math_exp itself is actually defined via the FUNC1 macro, using the math_1 wrapper function to call the C library exp function with some error handling and type conversion:
FUNC1(exp, exp, 1,
"exp(x)\n\nReturn e raised to the power of x.")
但是，C函数实现本身完全依赖于平台，并且在现代硬件上通常会在硬件中使用 .您必须转向该函数的软件版本才能找到在Python中实现此目标的起点.
However, the C function implementation itself is entirely platform dependent, and on modern hardware is usually taken care of in hardware. You would have to turn to a software version of the function to find a starting point to implement this in Python.
您可以将fdlibm实现用作起点，也许，这是该库中C语言中exp函数实现的链接:
You could use the fdlibm implementation as such a starting point, perhaps, here is a link to the exp function implementation in C from that library:
或者您可以参考此实现:
or you could refer to this implementation instead:
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