This is a perfect place for a generator:
<code>
seq = [0xF0, 1, 2, 3, 0xF0, 4, 5, 6, 0xF1, 7, 8, 0xF2, 9, 10, 11, 12,
13, 0xF0, 14, 0xF1, 15]
def gengroups(seq):
group = []
for val in seq:
if val & 0x80 and group:
yield group
group = []
group.append(val)
yield group
if __name__ == "__main__":
print list(gengroups(seq))
</code>
The above assumes that the first value in the input sequence will have
0x80 set. Your implementation seems to makes the same assumption
though.
Also, just a note...
<code>
if len(local) > 0:
...
</code>
is better written
<code>
if local:
...
</code>
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