Simplify Chained Comparison

python pycharm
Brynn McCullagh picture Brynn McCullagh · Oct 22, 2014 · Viewed 85.9k times · Source

I have an integer value x, and I need to check if it is between a start and end values, so I write the following statements:

if x >= start and x <= end:
    # do stuff

This statement gets underlined, and the tooltip tells me that I must

simplify chained comparison

As far as I can tell, that comparison is about as simple as they come. What have I missed here?

Answer

John Zwinck picture John Zwinck · Oct 22, 2014

In Python you can "chain" comparison operations which just means they are "and"ed together. In your case, it'd be like this:

if start <= x <= end:

Reference: https://docs.python.org/3/reference/expressions.html#comparisons

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