Python：如何表达更少或相等，更大的环境？

Question

I want to do the following example in python:

x = 10 
y = 8

if x-5 <= y <= x+5:
     print(y)

I see that this is working, but I would like to know if it's "ok" like this, if there is a better solution or something I have to consider doing it like this.

Answer 1

Chained expressions are acceptable in Python:

Comparisons can be chained arbitrarily, eg, x < y <= z is equivalent to x < y and y <= z , except that y is evaluated only once (but in both cases z is not evaluated at all when x < y is found to be False ).

In fact, because and is lazy and the syntax is cleaner, they are preferable .

Just be aware that chained expressions take priority. For example, see Why does the expression 0 < 0 == 0 return False in Python? .