Python - 有没有办法将操作(+ - */)存储在列表中或作为变量? [英] Python - is there a way to store an operation(+ - * /) in a list or as a variable?

问题描述

我问的原因纯粹是好奇.我可以看到，如果您事先不知道要对某些变量应用哪些操作，或者在递归调用的某个级别期间应用不同的操作，这可能很有用，或者可能只是让某些事情变得更简单和/或更整洁.

The reason I ask is pure curiosity. I could see, possibly, that this might be useful if you didn't know ahead of time what operations you wanted to apply to certain variables, or to apply a different operation during a certain level in a recursive call, or perhaps it may just make certain things easier and/or neater.

虽然我只是推测，这可能是一个非常糟糕的主意，但总的来说我只是好奇.

Though am just speculating, it could be a really bad idea, but overall am just curious.

推荐答案

您可以使用 operator 模块.

You may use operator module.

operator 模块导出一组高效函数对应于 Python 的内在运算符.例如，operator.add(x, y) 等价于表达式 x+y.功能名称是用于特殊类方法的名称；变体没有为了方便起见，还提供了前导和尾随 __.

The operator module exports a set of efficient functions corresponding to the intrinsic operators of Python. For example, operator.add(x, y) is equivalent to the expression x+y. The function names are those used for special class methods; variants without leading and trailing __ are also provided for convenience.

所以在列表中存储操作"就像这样简单:

So storing "operation" in list is as simple as:

import operator
operations = [operator.add, operator.sub]
# add two numbers
s = operations[0](1, 2)

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