acq=['A1', 'A2', 'D', 'A3', 'A4', 'A5', 'D', 'A6']
all_list=[]
ll=[]
for i in acq:
if i == 'D':
all_list.append(ll)
ll=[]
continue
ll.append(i)
all_list.append(ll)
print(*all_list,sep='\n')
from itertools import groupby
acq = ["A1", "A2", "D", "A3", "A4", "A5", "D", "A6"]
for v, g in groupby(acq, lambda v: v == "D"):
if not v:
print(list(g))