How to check two variables against two values

Question

I have two variables, a and b, and I have some combinations:

and I need to match all the four conditions in one line. I am trying to do with:

if ((a, b) in ['', None, '', None]))

However, this does not produce the desired result.

You're asking if a tuple is in a list of strings and Nones, which it never will be. Ask instead if it's in a list *of tuples*, where it might be. — jonrsharpe, Oct 22 '19 at 07:18
Possible duplicate of [Can Python test the membership of multiple values in a list?](https://stackoverflow.com/questions/6159313/can-python-test-the-membership-of-multiple-values-in-a-list) — Georgy, Oct 22 '19 at 08:26
"all the four conditions in one line" - why? Do you have a shortage of newline characters in your environment? — paxdiablo, Aug 10 '20 at 07:53

score 1 · Answer 1 · answered Oct 22 '19 at 07:22

1

Just use a list of tuples:

if (a,b) in [(None, None),("", None),("", ""),(None, "")]:

answered Oct 22 '19 at 07:22

Florian H

score 1 · Answer 2 · answered Oct 22 '19 at 07:25

1

you could use a set:

if set((a, b)) <= set((None, "")):

<= between sets tests if one is a subset of the other.

answered Oct 22 '19 at 07:25

hiro protagonist

1

Its also faster then others answers (constructing `list` of `tuples`). – Saleem Ali Oct 22 '19 at 07:31

score -1 · Answer 3 · answered Oct 22 '19 at 07:20

-1

do this

cond = [('', None),(None,''),('',''),(None, None)] 
if (a,b) in cond:
    # code

answered Oct 22 '19 at 07:20

sahasrara62

Although this code might solve the problem, a good answer should also explain **what** the code does and **how** it solves the problem. – BDL Oct 22 '19 at 08:13
@BDL `print('hello world)` no point to explain what print does or how it works, above code is in plain english and easy to understand – sahasrara62 Oct 22 '19 at 08:18

3 Answers3