Splitting a list

Andrea Griffini agriff at tin.it
Wed Sep 1 08:04:17 CEST 2004


On Tue, 31 Aug 2004 09:54:17 -0400, "Ian Sparks"
<Ian.Sparks at etrials.com> wrote:

>string.split() is very useful, but what if I want to split a list of integers on some element value?

Here are a few early-morning attempts :-)

def lsplit(L,sep):
    try:
        i = L.index(sep)
        return [L[:i]] + lsplit(L[i+1:],sep)
    except ValueError:
        return [L]

def lsplit2(L,sep):
    i = 0
    res = []
    while True:
        try:
            j = L.index(sep,i)
            res.append(L[i:j])
            i = j+1
        except ValueError:
            res.append(L[i:])
            break
    return res

def lsplit3(L,sep):
    i = 0
    while True:
        try:
            j = L.index(sep,i)
            yield L[i:j]
            i = j+1
        except ValueError:
            yield L[i:]
            break


HTH
Andrea



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