How to reverse all booleans in the list in python? [duplicate]

Answer 1

You can do this with list comprehension:

a = [True, False, True]
b = [not bool for bool in a]

What this does is basically analogous to:

a = [True, False, True]
b = []
for bool in a:
    b.append(not bool)

Or more generally:

new_list = [expression for item in a_list]

is essentially the same as:

new_list = []
for item in a_list:
    new_list.append(expression)

where expression can contain item

The reason your version doesn't work is that not can only operate on booleans and will implicitly convert anything passed to it to a boolean. A non-empty list results in True and applying not to that gives you False

Answer 2

You can map the not operator as a function to each item. And be sure to import operator as well:

map(operator.not_, [True, False, True]) # apply the not unary operator to each list item

Answer 3

You could use list comprehension and not all the items

a=[True,False,True] 
b=[not c for c in a]

not a provided False due to the fact it checks list is empty since it isn't returns True so it is converted into false

a=[True]
not a
False
a=[False]
not a
True