Python find whole line in output

Question

I'm running a command where the output is a list of numbers:

output = subprocess.run(['command'], stdout = subprocess.PIPE)

The output (output.stdout.decode('utf-8')) is something like this:

I need to find if a specific number is not in that list. The problem is if I search using if num not in list: for num=3 I will get true since the number 534 is in that list.

How can I check if a number (in a line of its own) is in the list?

Possible duplicate of [Fastest way to check if a value exist in a list](https://stackoverflow.com/questions/7571635/fastest-way-to-check-if-a-value-exist-in-a-list) — eyllanesc, Apr 17 '18 at 09:17

score 0 · Accepted Answer · answered Apr 17 '18 at 09:14

just split your list and check either for "word" or for integer, using set comprehension to get rid of duplicates:

if 3 in {int(x) for x in output.stdout.decode('utf-8').split()}:

a simpler way is also possible with the direct output of split:

if "3" in output.stdout.decode('utf-8').split():

(less powerful if integers can start with 0: 03)

score 0 · Answer 2 · answered Apr 17 '18 at 09:17

0

Just adding to the answer by Jean-Francois . Split() by default splits on white spaces, but since you would be needing to split on lines, I would suggest split('\n') to do the splitting, this way the code would be more resilient

answered Apr 17 '18 at 09:17

Nishant Ravindran

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score 0 · Answer 3 · answered Apr 17 '18 at 09:25

0

You can use re module as well:

import re

lookup=3

pattern = re.compile('\b{}\b'.format(lookup))

if pattern.search(output.stdout.decode('utf-8')):
    ...

answered Apr 17 '18 at 09:25

zipa

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Python find whole line in output

3 Answers3