python modify strings in nested lists

Question

I have a strings in nested lists structure, can someone give me a tip on how to modify the strings in a for loop?

For example, I am trying to delete the last couple characters my string these values: /CLG-MAXFLOW

If I do

example = 'slipstream_internal/slipstream_hq/36/CLG-MAXFLOW'

print(example[0:36])

This is what I am looking for:

'slipstream_internal/slipstream_hq/36'

But how can I apply this to strings inside nested lists?

devices = [['slipstream_internal/slipstream_hq/36/CLG-MAXFLOW'],
            ['slipstream_internal/slipstream_hq/38/CLG-MAXFLOW',
            'slipstream_internal/slipstream_hq/31/CLG-MAXFLOW'],
            ['slipstream_internal/slipstream_hq/21/CLG-MAXFLOW',
            'slipstream_internal/slipstream_hq/29/CLG-MAXFLOW'],
            ['slipstream_internal/slipstream_hq/25/CLG-MAXFLOW',
            'slipstream_internal/slipstream_hq/9/CLG-MAXFLOW',
            'slipstream_internal/slipstream_hq/6/CLG-MAXFLOW'],
            ['slipstream_internal/slipstream_hq/13/CLG-MAXFLOW',
            'slipstream_internal/slipstream_hq/14/CLG-MAXFLOW',
            'slipstream_internal/slipstream_hq/30/CLG-MAXFLOW'],
            ['slipstream_internal/slipstream_hq/19/CLG-MAXFLOW',
            'slipstream_internal/slipstream_hq/8/CLG-MAXFLOW',
            'slipstream_internal/slipstream_hq/26/CLG-MAXFLOW',
            'slipstream_internal/slipstream_hq/24/CLG-MAXFLOW'],
            ['slipstream_internal/slipstream_hq/34/CLG-MAXFLOW',
            'slipstream_internal/slipstream_hq/11/CLG-MAXFLOW',
            'slipstream_internal/slipstream_hq/27/CLG-MAXFLOW',
            'slipstream_internal/slipstream_hq/20/CLG-MAXFLOW',
            'slipstream_internal/slipstream_hq/23/CLG-MAXFLOW'],
            ['slipstream_internal/slipstream_hq/15/CLG-MAXFLOW',
            'slipstream_internal/slipstream_hq/37/CLG-MAXFLOW',
            'slipstream_internal/slipstream_hq/39/CLG-MAXFLOW',
            'slipstream_internal/slipstream_hq/10/CLG-MAXFLOW']]

You can have a nested for loop and use substring or indexing to delete the last few characters. — David Lee
– David Lee, Commented Jul 2, 2021 at 2:03
Something like for device in devices? Any chance you could give me some more tips? — bbartling
– bbartling, Commented Jul 2, 2021 at 2:05
What do you mean by "apply"? Do you know how to do anything at all with a nested list? Do you know how to do anything at all with an unnested list? Where exactly is the conceptual difficulty? When you say that you want to "modify" the strings, what exactly does that mean? Could you show an example of exactly what the list should look like after the code runs? — Karl Knechtel
– Karl Knechtel, Commented Jul 2, 2021 at 2:08
@KarlKnechtel Although the question could have been improved, I believe it was 'detailed' enough to understand what the OP wants... — David Lee
– David Lee, Commented Jul 2, 2021 at 2:11

user15801675 · Accepted Answer · 2021-07-02 02:05:18Z

1

Not exactly the best solution but worth giving a try:

def check_about(lists:list):
    for i,j in enumerate(lists):
        if isinstance(j,list):
            check_about(j)
        else:
            lists[i]=lists[i].strip('/CLG-MAXFLOW')
    return lists
print(check_about(devices))

answered Jul 2, 2021 at 2:05

user15801675

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1 Comment

bbartling Over a year ago

well that seemed to work thank you it keeps my nested list data structure

Carmoreno · Accepted Answer · 2021-07-02 02:45:11Z

If your output must be the same structure given by devices variable, but with the string changed, then you can do this:

for row in devices:
  for index, string in enumerate(row):
    row[index] = '/'.join(string.split('/')[:-1])

Output:

[['slipstream_internal/slipstream_hq/36'],
 ['slipstream_internal/slipstream_hq/38',
  'slipstream_internal/slipstream_hq/31'],
 ['slipstream_internal/slipstream_hq/21',
  'slipstream_internal/slipstream_hq/29'],
 ['slipstream_internal/slipstream_hq/25',
  'slipstream_internal/slipstream_hq/9',
  'slipstream_internal/slipstream_hq/6'],
 ['slipstream_internal/slipstream_hq/13',
  'slipstream_internal/slipstream_hq/14',
  'slipstream_internal/slipstream_hq/30'],
 ['slipstream_internal/slipstream_hq/19',
  'slipstream_internal/slipstream_hq/8',
  'slipstream_internal/slipstream_hq/26',
  'slipstream_internal/slipstream_hq/24'],
 ['slipstream_internal/slipstream_hq/34',
  'slipstream_internal/slipstream_hq/11',
  'slipstream_internal/slipstream_hq/27',
  'slipstream_internal/slipstream_hq/20',
  'slipstream_internal/slipstream_hq/23'],
 ['slipstream_internal/slipstream_hq/15',
  'slipstream_internal/slipstream_hq/37',
  'slipstream_internal/slipstream_hq/39',
  'slipstream_internal/slipstream_hq/10']]

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