Diminuer la taille d'une liste

['1' , '2' , ':', '3', '6', ':', '4', '3']

['12', ':', '36', ':', '43']

l = ['1' , '2' , ':', '3', '6', ':', '4', '3']
l1 = list()
for x in l:
    if x == ':' or not l1 or l1[-1] == ':':
        l1.append(x)
    else:
        l1[-1] += x
print(l1)

import re

l = ['1' , '2' , ':', '3', '6', ':', '4', '3']
l1 = re.split("(:)", "".join(l))
print(l1)

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