Watch out! This tutorial is over 7 years old. Please keep this in mind as some code snippets provided may no longer work or need modification to work on current systems.
Python comparisons are unusual in that chaining comparisons is allowed, and works reasonably. Chained comparisons translate to a series of anded terms, repeating the middle. For instance, a < b == c <= d is interpreted as a < b and b == c and c <= d. The only other note is that the middle expression (4 in the below example) is evaluated only once. For a constant, this doesn’t matter, but it will make a difference for expressions which have a side-effect. Note that this does not always have the desired effect. For instance, 3 != 2 != 3 is true, which might not be what you wanted.
