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On Sunday, 10 February 2019 15:15:32 GMT Jon Ribbens wrote: > As an aside, how is 'math.sin' actually implemented? mathmodule.c > refers to the function 'math_sin' but that name is not defined > anywhere in the Python source code. I'm a bit mystified as to how > CPython manages to compile! I used gdb to find it: Breakpoint 1, math_sin (self=<module at remote 0x7fffea716098>, args=0) at / usr/src/debug/python3-3.7.2-4.fc29.x86_64/Modules/mathmodule.c:1176 1176 FUNC1(sin, sin, 0, (gdb) l 1171 "remainder($module, x, y, /)\n--\n\n" 1172 "Difference between x and the closest integer multiple of y. \n\n" 1173 "Return x - n*y where n*y is the closest integer multiple of y. \n" 1174 "In the case where x is exactly halfway between two multiples of\n" 1175 "y, the nearest even value of n is used. The result is always exact.") 1176 FUNC1(sin, sin, 0, 1177 "sin($module, x, /)\n--\n\n" 1178 "Return the sine of x (measured in radians).") 1179 FUNC1(sinh, sinh, 1, 1180 "sinh($module, x, /)\n--\n\n" (gdb) Barry

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