python - 如何使用for循环将2个列表/数组与python进行比较？

Question

我想比较 ListA[0] 和 ListB[0]...等

ListA = [itemA, itemB, itemC]
ListB = [true, false, true]

for item in ListA:
    if ListB[item] == True:
        print"I have this item"

目前的问题是 [item] 不是一个数字，所以 ListB[item] 将不起作用。如果我想做这样的事情，正确的方法是什么？

Answer 1

您可以使用itertools.compress:

Docstring:
compress(data, selectors) --> iterator over selected data

Return data elements corresponding to true selector elements.
Forms a shorter iterator from selected data elements using the
selectors to choose the data elements.

---

In [1]: from itertools import compress

In [2]: l1 = ['a','b','c','d']

In [3]: l2 = [True, False, True,False]

In [4]: for i in compress(l1,l2):
   ...:     print 'I have item: {0}'.format(i)
   ...:     
I have item: a
I have item: c