列表中的数学运算 [英] Math operations from a list

问题描述

我从.txt文件导入了myList(我将数字转换为整数)

I imported myList from a .txt file (I converted the numbers to integers)

from math import *
myList = [100, 'sin', 0, 1]
x = pi

如何为给定的x值调用sin函数?

How would I go about calling the sin function for my given value of x?

myList[1](pi)

我希望这只会返回sin(pi)，但不会，因为它只是字符串'sin(x)'

I hoped this would simply return sin(pi), but it does not, because it is just the string 'sin(x)'

推荐答案

不要将函数存储为字符串文字，请存储实际函数.

Do not store functions as string literals, store the actual functions.

>>> from math import sin, exp, log
>>> funcs = [sin, exp, log]
>>> x = 0
>>> funcs[0](x)
0.0
>>> funcs[1](x)
1.0
>>> funcs[2](2.71)
0.9969486348916096

但是，如果您不打算对该功能列表做更多的事情，则可以直接调用它们.

However, if you don't plan to do something more involved with that list of functions, you can just call them directly.

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