Better way to check multiple variables equal a single value in Python

Question

In Python I want to check the following:

if x is None and y is None and z is None and ...

I'd rather say something like:

if x, y, z is None:

But that's not valid syntax. Is there a better way to do this?

Alan · Accepted Answer · 2016-02-10 19:30:39Z

4

You want to make sure all expressions satisfy a condition. The Python builtin all is made precisely for that. Since we have no need to introduce a new variable name, here I'll use the name _, which is a valid Python name and is the convention for a "throw-away" variable.

all(_ is None for _ in (x,y,z))

answered Feb 10, 2016 at 19:30

Alan

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Comments

Jace Browning · Accepted Answer · 2016-02-16 02:25:28Z

0

If you only care about falsy-ness (which is often the case):

if not all((x, y, z)): ...

edited Feb 16, 2016 at 2:25

answered Feb 10, 2016 at 23:00

Jace Browning

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1 Comment

Chris Curvey Over a year ago

did you mean "if not any((x,y,z)):"

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