CODEWITHSUNDEEP
pythonregexdjangopython-2.7django-views
user3525985
user3525985

Reputation: 109

How do I isolate a number from a string in python(django)?

In one of my forms i send two bits of information like this:

  <input type ="hidden" name= "items" value="{{item.pk}} {{item.name}}">

when I get the information with request.POST.get, I get "202 book".

How can I seperate just the number from the string or just the word? I did a split:

  pks = request.POST.getlist("items")
  for pk in pks:
      pk.split(' ',1)

but the number isn't always a 1 or 2 digit number, it may be 2 or 3 etc. Also I might have the situations where the name is book1 so I would need that last "1" to remain.

Any ideas how I may go about this?

Upvotes: 1

Views: 91

Answers (4)

timgeb
timgeb

Reputation: 78750

Unless I'm misinterpreting your question, why don't you just split the string and extract the first and second element from the resulting list? Demo:

>>> mystr = "202 book"
>>> lst = "202 book".split()
>>> num = lst[0] # or int(lst[0])
>>> num
'202'
>>> other = lst[1]
>>> other
'book'

If you have a string which contains numbers and words which could contain a number, but should not count when looking for numbers, you can do:

>>> mystr = 'This 101 5is 4 600a 42 de3mo string12'
>>> re.findall(r'\b\d+\b', mystr)
['101', '4', '42']
>>> re.findall(r'(?!\d+\b)\w+', mystr)
['This', '5is', '600a', 'de3mo', 'string12']

Upvotes: 2

Daniel Roseman
Daniel Roseman

Reputation: 599778

You have some useful answers on how to split up the data, but since you seem to be controlling both the template and the view, why are you putting them in the same field to begin with? Why not put them in two separate fields?

<input type="hidden" name="item_pk" value="{{item.pk}}">
<input type="hidden" name="item_name" value="{{item.name}}">

Upvotes: 1

Kasravnd
Kasravnd

Reputation: 107337

you can use this surely it work !

my_digit = ''.join(temp for temp in my_string if temp.isdigit())

or if you want to have the value of digit you can use int(my_digit)

Upvotes: 1

Luis Enrique
Luis Enrique

Reputation: 450

I have never used django, but how about using regular expressions?

import re

pk = "202 book";
print re.findall(r'\d\d?\d?',pk)

Upvotes: 0

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