How to extract sub string of variable length using Python

Question

I am retrieving data by reading multi line python string.

My string is shown below:

Hostname: windos
Model: OS_5000
OS: 18.2
OS Kernel 64-bit  [2020_Stable]
....
.....
....

I am looking to extract Model value i.e. 5000 from this string. Not sure how to do it.

 dpath = op.response()
                    dpath = dpath[dpath.find("Model:")+ 6 : dpath[dpath.find("Model:")+ 11]

Also, model string could be of variable length. Is there any better way of doing it?

EDIT: Model value could be numeric or non-numeric.

After you've found the start of the model number, find the first newline ("\n") after that position (str.find() takes an optional second parameter to specify the starting position to search). Use that position as the end of your slice. — jasonharper
– jasonharper, Commented Jun 25, 2020 at 19:47
We need to know what assumptions we can make about string that are safe. — Andrew Allaire
– Andrew Allaire, Commented Jun 25, 2020 at 19:48

One Lyner · Accepted Answer · 2020-06-25 20:08:48Z

1

You should try with a regular expression:

import re

re.search('Model: (.*)', dpath).group(1)

edited Jun 25, 2020 at 20:08

answered Jun 25, 2020 at 19:49

One Lyner

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Comments

Pygirl · Accepted Answer · 2020-06-25 19:49:26Z

1

Try : (using Regex)

import re
s = """Hostname: windos
Model: 5000
OS: 18.2
OS Kernel 64-bit  [2020_Stable]"""
match = re.search('Model: (\d+)', s)
if match:
    print(match.group(1))

If multiple Model in the string:

import re
s = """Hostname: windos
Model: 5000
OS: 18.2
Model: 12343434
OS Kernel 64-bit  [2020_Stable]"""
match = re.findall('Model: (\d+)', s)
if match:
    print(match)

['5000', '12343434']

answered Jun 25, 2020 at 19:49

Pygirl

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Comments

Денис Иванов · Accepted Answer · 2020-06-25 19:55:13Z

1

Use regular expression:

import re
model = re.findall('model\:\s*(\d+)', dpath, re.I)
if model:
    model = model[0]

Here I use "re.I" to search case insensitive word "model" "\s*" — means if there will be some space after the colon or not it won't break this script. So it find numbers in next cases: Model: 5000 Model:5000 model: 5000 model: 5000

edited Jun 25, 2020 at 19:55

answered Jun 25, 2020 at 19:50

Денис Иванов

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3 Comments

Ammad Over a year ago

Thanks: But model could be non numeric as well. How to cover this case?

Pygirl Over a year ago

use \w+ then in place of \d+

Денис Иванов Over a year ago

@Ammad very simple: 'model\:\s*(\S+)' '\S' – means non space symbol

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