CODEWITHSUNDEEP
pythonstringlist
Mairaj Khan
Mairaj Khan

Reputation: 359

get some data from string python

I have a string like:

u'c-100001,e-100001,e-100011,e-100009'

I want to get value like 

[100001,100011,100009]

I tried:

l = note_to.split('-')
k = length(l)
j=[]
for i in (0,k):
   if k!==0 & k%2!= 0:
      j.append(l[i])

I mean I used loop.

Upvotes: 0

Views: 70

Answers (3)

Martijn Pieters
Martijn Pieters

Reputation: 1121904

Split your string on the comma and use a list comprehension:

[int(el[2:]) for el in note_to.split(',') if el.startswith('e-')]

I'm assuming you wanted to only get values that start with e- here; you need to clarify your question if you wanted something different.

Because we already determined that the element starts with e-, getting the integer value is as simple as skipping the first 2 characters.

Demo:

>>> note_to = u'c-100001,e-100001,e-100011,e-100009'
>>> [int(el[2:]) for el in note_to.split(',') if el.startswith('e-')]
[100001, 100011, 100009]

If you wanted to get unique values only, and order doesn't matter, use a set, and use str.rpartition() to split off the starting string (which could be longer than 2 characters or missing altogether, perhaps):

set(int(el.rpartition('-')[-1]) for el in note_to.split(','))

You can always turn that back into a list, based on your exact needs.

Demo:

>>> set(int(el.rpartition('-')[-1]) for el in note_to.split(','))
set([100001, 100011, 100009])
>>> list(set(int(el.rpartition('-')[-1]) for el in note_to.split(',')))
[100001, 100011, 100009]

Upvotes: 0

Ashwini Chaudhary
Ashwini Chaudhary

Reputation: 250951

Use a list comprehension with str.startswith and str.split:

>>> s = u'c-100001,e-100001,e-100011,e-100009'
>>> [int(x.split('-')[1]) for x in s.split(',') if x.startswith('e-')]
[100001, 100011, 100009]

If you want all the items not just that start with e- then remove the if x.startswith('e-') part.

>>> [int(x.split('-')[1]) for x in s.split(',')]
[100001, 100001, 100011, 100009]

In you want only unique items then pass the list to a set() or use set with a generator expression.

Upvotes: 1

sshashank124
sshashank124

Reputation: 32189

You can do it as follows:

string = 'c-100001,e-100001,e-100011,e-100009'
your_list = string.split(',e-')[1:]

>>> your_list
[100001,100011,100009]

Upvotes: 0

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