Evaluate multiple variables in one 'if' statement?

Question

Say I have a bunch of variables that are either True or False. I want to evaluate a set of these variables in one if statement to see if they are all False like so:

if var1, var2, var3, var4 == False:
    # do stuff

Except that doesn't work. I know I can do this:

if var1 == False and var2 == False and var3 == False and var4 == False:
    # do stuff

But that's fairly ugly - especially if these if statements are going to occur a lot in my code. Is there any sort of way I can do this evaluation with a cleaner syntax (like the first example)?

Answer 1

You should never test a boolean variable with == True (or == False). Instead, either write:

if not (var1 or var2 or var3 or var4):

or use any (and in related problems its cousin all):

if not any((var1, var2, var3, var4)):

or use Python's transitive comparisons:

if var1 == var2 == var3 == var4 == False:

Answer 2

How about this:

# if all are False
if not any([var1, var2, var3, var4]):
    # do stuff

or:

# if all are True
if all([var1, var2, var3, var4]):
    # do stuff

These are easy to read, since they are in plain English.