Question

In python, how can I split a long list into a list of lists wherever I come across ‘-‘. For example, how can I convert:

['1', 'a', 'b','---', '2','c','d','---','3','123','e','---','4']

to

[['1', 'a', 'b'],['2','c','d'],['3','123','e'],['4']]

Many thanks in advance.

Answer 1

In [17]: import itertools
# putter around 22 times
In [39]: l=['1', 'a', 'b','---', '2','c','d','---','3','123','e','---','4']

In [40]: [list(g) for k,g in itertools.groupby(l,'---'.__ne__) if k]
Out[40]: [['1', 'a', 'b'], ['2', 'c', 'd'], ['3', '123', 'e'], ['4']]