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))
list列表计数方法
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