How do you use OR,AND in conditionals?

Question

I have found myself many times,with things that I need to be all or at least one equal to something,and I would write something like that:

if a==1 and b==1:
   do something

or

if a==1 or b==1:
   do something

If the number of things is small its ok,but it is still not elegant.So, is there a better way for a significant number of things, to do the above?Thanks.

Answer 1

Option 1: any / all

For the general case, have a look at any and all:

if all(x == 1 for x in a, b, c, d):

if any(x == 1 for x in a, b, c, d):

You can also use any iterable:

if any(x == 1 for x in states):

Option 2 - chaining and in

For your first example you can use boolean operator chaining:

if a == b == c == d == 1:

For your second example you can use in:

if 1 in states:

Option 3: any/all without a predicate

If you only care whether the value is truthy you can simplify further:

if any(flags):

if all(flags):