如何检查变量是否存在于多个列表中？

Question

这是我代码的摘录！

division = ["Division","Divide","/","div"]
multiplication =["*","x","times","multiply","multiplication","multiple"]
subtraction = ["-",'minus','subtract','subtraction']
addition = ['+','plus','addition','add']
root = ['root','squareroot','square root']
square = ['square','squared','power 2']

choice = input('calculation type')
print(choice == (division or multiplication or subtraction or addition))

到目前为止，它只给出“假”。如何检查变量是否存在于多个列表中？我试着在名单里列清单，但我还是觉得“假”，这是代码.

division = ["Division","Divide","/","div"]
multiplication = ["*","x","times","multiply","multiplication","multiple"]
subtraction = ["-",'minus','subtract','subtraction']
addition = ['+','plus','addition','add']
root = ['root','squareroot','square root']
square = ['square','squared','power 2']
basic_double = [division,multiplication,subtraction,addition]
basic_single = [root,square]
choice = input('calculation type')
print(choice == basic_double or basic_single)

如有任何帮助，将不胜感激！

Answer 1

测试choice是否在列表的any中：

any(choice in ls for ls in [division, multiplication, subtraction, addition])

如果给定可迭代的元素中至少有一个是真实的，则any返回True。

choice in ls测试选择是否是列表中的一个元素。

choice in ls for ls in [division, multiplication, subtraction, addition]是一个生成器理解，这意味着它是一个迭代器，它返回choice in ls对于[division, multiplication, subtraction, addition]中任何可能的ls的结果。

如果其中一个列表包含choice，则any将返回True，否则返回False。

Answer 2

您可以使用itertools.chain()在所有列表中检查选择如下：

if choice in chain(division, multiplication, subtraction, addition):

Answer 3

现在，您正在将字符串、选择与一系列列表进行比较。当您比较两种不同的数据类型时，这永远不会是真的。

您应该使用"in“关键字对每个列表进行检查。

if choice in division:
     #this returns true if the String set to choice is in the list of objects in division.
else if choice in multiplication:
.
.
.

这种比较将帮助您在列表中找到要查找的单词。