[Python知识库]python--Counter()统计列表中超过一半的数字

# 方法一：使用collections模块中的Counter函数
        # 然后调用most_common()方法
        # from collections import Counter

        # a = Counter(nums)
        # b = a.most_common()[0][0]
        # return b
        ============
		a = [1, 2, 3, 2, 2, 2, 5, 4, 2]
		b = Counter(a)
		print(b)  # Counter({2: 5, 1: 1, 3: 1, 5: 1, 4: 1})
		print(b.items())  # dict_items([(1, 1), (2, 5), (3, 1), (5, 1), (4, 1)])
		print(b.most_common())  # [(2, 5), (1, 1), (3, 1), (5, 1), (4, 1)]
		print(b.most_common()[0][0])  # 2
		==============

        # 或者
        import collections
        nums = [1, 2, 3, 2, 2, 2, 5, 4, 2]
        counts = collections.Counter(nums)
        print(counts) # Counter({2: 5, 1: 1, 3: 1, 5: 1, 4: 1})
        print(counts.keys())  # dict_keys([1, 2, 3, 5, 4])
        print(counts.get(2))  # 5
        # key=counts.get 每个数字出现的次数
        return max(counts.keys(), key=counts.get)