Hi, I have a string like this:
'|Action and Adventure|Drama|Science-Fiction|Fantasy|'
How can I convert it to a tuple or a list?
Thanks.
+1
A:
You want str.split():
>>> s = '|Action and Adventure|Drama|Science-Fiction|Fantasy|'
>>> s.split('|')
['', 'Action and Adventure', 'Drama', 'Science-Fiction', 'Fantasy', '']
jathanism
2010-10-13 04:26:53
+1
A:
Hi,
If you want to just split your string at the | character you use:
myStr.split('|')
If you also want all zero-length element removed (like the ones from the ends) you:
def myFilter(el): return len(el) > 0
filter(myFilter, myStr.split('|'))
Alin Purcaru
2010-10-13 04:33:36
Thanks jathanism and Alin.
Antonio Pardo
2010-10-13 04:42:44
Thanks won't work here ;-), Set this answer as your accepted answer" If so :)
Tumbleweed
2010-10-13 04:59:11
`[ x for x in myStr.split('|') if len(x) > 0 ]` is much cleaner.
Jack Kelly
2010-10-13 05:05:00
+5
A:
>>> s = '|Action and Adventure|Drama|Science-Fiction|Fantasy|'
>>>
>>> [item for item in s.split('|') if item.strip()]
['Action and Adventure', 'Drama', 'Science-Fiction', 'Fantasy']
>>>
If you'd rather have a tuple then:
>>> tuple(item for item in s.split('|') if item.strip())
('Action and Adventure', 'Drama', 'Science-Fiction', 'Fantasy')
>>>
Manoj Govindan
2010-10-13 04:37:26
Also note that you should (probably) not use tuples in your case because you want multiple single component items, not one item with variable number of components.
Alin Purcaru
2010-10-13 04:47:51
I wanted to point out that it is not semantically correct to use tuples when you actually need lists.
Alin Purcaru
2010-10-13 05:00:27
Not semantically correct? Not sure why you say that, for two reasons (1) The OP specifically asked for a tuple _or_ a list. (2) unless you are planning to modify the sequence later, a tuple would do just as fine as a list.
Manoj Govindan
2010-10-13 05:04:57
@Alin Purcaru Tuples are just ordered lists of elements - they _are_ lists. If there's no need to use any of `list`'s methods, then `tuple` is a fine, concise choice of data storage.
Tim McNamara
2010-10-13 05:07:41
A tuple(it doesn't matter how a programming language implements it) is an n-pair. When you say pair you know that the elements are connected and not independent. By analogy the components of a tuple (I don't name them items because they're not items) need to have a logical connection. On the other hand a list is just some items, you can add or remove and you will have the same object, but with more or less items. Example: (x1,x2) is a point in 2D, but (x1,x2,x3) - the same tuple with one element added - represents a point in 3D; [2,3,5] is a list of prime numbers, just like [2,3,5,7] and so on
Alin Purcaru
2010-10-13 05:36:50
`By analogy the components of a tuple (I don't name them items because they're not items) need to have a logical connection`: I beg to differ. To quote wikipedia: `In mathematics and _computer science_, a tuple is an ordered list of elements.`. That definition doesn't require the components to have a logical connection.
Manoj Govindan
2010-10-13 05:52:40
Following that logic lists should be fine since lists are also defined to be ordered: `In computer science, a list or sequence is an abstract data structure that implements an ordered collection of values`. http://en.wikipedia.org/wiki/List_(computing)
Manoj Govindan
2010-10-13 07:11:35
Alin Purcaru's argument is the one supported by Guido. Tuples are like records. Lists are sequences of objects of the same type.
FogleBird
2010-10-13 13:22:26
I thought that seeing the difference between tuples and lists was common sense and I did not expect to generate such a comment **list** :).
Alin Purcaru
2010-10-13 16:22:07
What, you don't mean a tuple of comments? ;) Seriously, yes, I see your point. Thanks for commenting.
Manoj Govindan
2010-10-13 18:15:16
+1
A:
Strip 'string'.strip('|')
>>> heading = '|Action and Adventure|Drama|Science-Fiction|Fantasy|'
>>> tuple(heading.strip('|').split('|'))
('Action and Adventure', 'Drama', 'Science-Fiction', 'Fantasy')
Slice 'string'[1:-1]
>>> heading = '|Action and Adventure|Drama|Science-Fiction|Fantasy|'
>>> tuple(heading[1:-1].split('|'))
('Action and Adventure', 'Drama', 'Science-Fiction', 'Fantasy')
For List remove the tuple() call.
kevpie
2010-10-13 05:01:28
+1
A:
strip() gets rid of the leading and trailing chars, split() divvies up the remainder:
>>> s.strip('|').split('|')
['Action and Adventure', 'Drama', 'Science-Fiction', 'Fantasy']
Mark Tolonen
2010-10-13 05:30:20
A:
List
seq = '|Action and Adventure|Drama|Science-Fiction|Fantasy|'.split('|')
Tuple
seq = tuple(seq)
If you want to strip empty items, pass the output through filter(None, seq). If you assume outer | always, just slice with seq[1:-1].
Matt Joiner
2010-10-13 13:39:23