让用户决定对数字列表应用哪种操作

Question

我最近选择了Python，想知道如何做到以下几点。假设我们有3个数字的列表：x = [1, 2, 3]然后，我们问用户如何处理这些数字：whatdo = raw_input('> ')例如，用户输入“ +2”。现在如何将“ + 2”应用于列表的所有元素？

Answer 1

import operator as oper

operations = {

    '+': oper.add,

    '-': oper.sub,

    '*': oper.mul

}

numbers = [1, 2, 3]

op, num1 = raw_input("> ").split()

num1 = int(num1)

op = operations[op]

y = [op(num1, num2) for num2 in numbers]

print y

--output:--

> * 30

[30, 60, 90]

Answer 2

import operator as oper

operations = {

    '+': oper.add,

    '-': oper.sub,

    '*': oper.mul

}

numbers = [1, 2, 3]

op, num1 = raw_input("> ").split()

num1 = int(num1)

op = operations[op]

y = [op(num1, num2) for num2 in numbers]

print y

--output:--

> * 30

[30, 60, 90]