Simplification of if multiple conditions in python

Question

I want to pick out some items in one rectangular box with axis limits of (xmin, xmax, ymin, ymax, zmin, zmax). So i use the following conditions,

if not ((xi >= xmin and xi <= xmax) and (yi >= ymin and yi <= ymax) and (zi >= zmin and zi <= zmax)):
    expression 

But I think python has some concise way to express it. Does anyone can tell me?

Answer 1

Typical case for operator chaining:

if not (xmin <= xi <= xmax and ymin <= yi <= ymax and zmin <= zi <= zmax):

Not only it simplifies the comparisons, allowing to remove parentheses, while retaining readability, but also the center argument is only evaluated once , which is particularly interesting when comparing against the result of a function:

if xmin <= func(z) <= xmax:

(so it's not equivalent to 2 comparisons if func has a side effect)