from collections import abc
def flatten(iterable):
for item in iterable:
if isinstance(item, (str, bytes)):
yield item
elif isinstance(item, abc.Sequence):
yield from flatten(item)
else:
yield item
data = ['lloc', [['.', 'orgstart']]]
flat_data = list(flatten(data))
clear_data = list(i for i in flatten(data) if i != '.')