Check if number is between given range

Question

I came across an answer that we can check if number is between a given range by following method 10<=n<=100. I want to know how exactly this statement gets executed in python.I'm new to python and know how to code in java.

From the answers, I came to know that this feature is called chaining comparison operators. Thanks a lot for answers.

What do you mean exactly by "*how exactly this statement gets executed*"? — Maroun, Jan 02 '17 at 11:22
Check the first answer of [Hidden features of Python](http://stackoverflow.com/questions/101268/hidden-features-of-python) — fredtantini, Jan 02 '17 at 11:24

score 3 · Accepted Answer · edited Sep 26 '17 at 22:09

this is 'how exactly this statement gets executed'

import dis

def f(n):
    return 10<=n<=100

print(dis.dis(f))

which gives

  6           0 LOAD_CONST               1 (10)
              3 LOAD_FAST                0 (n)
              6 DUP_TOP
              7 ROT_THREE
              8 COMPARE_OP               1 (<=)
             11 JUMP_IF_FALSE_OR_POP    21
             14 LOAD_CONST               2 (100)
             17 COMPARE_OP               1 (<=)
             20 RETURN_VALUE
        >>   21 ROT_TWO
             22 POP_TOP
             23 RETURN_VALUE

but did you really want to know that?

Chaining comparison operators may be a good reference.

It's really translating into 10 < n and n < 100

ebeneditos · Answer 2 · 2017-01-02T11:33:46.093

1

In python, these kind of double conditions are executed as consecutives ands, so:

10 <= n <= 100

is equal to:

(10 <= n) and (n <= 100)

And it returns a boolean that can either be True or False depending on whether the statement is met.

edited Jan 02 '17 at 11:33

answered Jan 02 '17 at 11:22

ebeneditos

2,542
1
15
35

Check if number is between given range

2 Answers2