I want to compare ListA[0] to ListB[0]...etc.
ListA = [itemA, itemB, itemC]
ListB = [true, false, true]
for item in ListA:
if ListB[item] == True:
print"I have this item"
Current problem is that [item] is not a number, so ListB[item] will not work. What is the correct way if I want to do something like this?
You can use 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
You can iterate through the lists this way.
for a, b in zip(ListA, ListB):
pass
Try this:
for item, have_it in zip(ListA, ListB):
if have_it:
print "I have item", item
try this
for name,value in itertools.izip(ListA, ListB):
if value == True:
print "Its true"
Or you can do something like this:
[ a for a,b in zip(ListA,ListB) if b==True ]
If you want to compare each element of ListA with the corresponding element of ListB (in other words the elements at the same index numbers), you can use a for loop that iterates over the index numbers rather than iterating over the actual elements of one list. So your code would be: (note that range(len(ListA)-1) gives you a list of the numbers from 0 to the length of ListA, minus 1 since it's 0-indexing)
for i in range(len(ListA)-1):
//ListA[i] will give you the i'th element of ListA
//ListB[i] will give you the i'th element of ListB
