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

Answer 1

You could do:

if var1 == var2 == var3 == var4 == False:
  do_stuff()

But, if the variables evaluate to true or false, you could also do this:

if var1 and var2 and var3 and var4:
  do_stuff()

Or

if all([var1, var2, var3, var4]):
  do_stuff()

Answer 2

You can use if var1 == var2 == var3 == False:

Answer 3

>>> not any([False, False])
True
>>> not any([True, False])
False
>>> 

Use the any() keyword.

Answer 4

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.

Answer 5

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 6

if all(not v for v in (var1, var2, var3, var4)):

That's for the "all false" branch. For "all true", just do if all((var2, var2, var3, var4)):.