def get_counts(sequence):
counts = {}
for x
in sequence:
if x
in counts:
counts[x] +=
1
else:
counts[x] =
1
return counts
def get_counts2(sequence):
counts = defaultdict(
int)
# 所有值均被初始化为 0
for x
in sequence:
counts[x] +=
1
return counts
def get_counts3(sequence):
return dict(Counter(sequence))
