参考 Find
most frequent element in a list in Python (tutorialspoint.com)
1. 法一：with max and count
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| # Given list
listA = [45, 20, 11, 50, 17, 45, 50,13, 45]
res = max(set(listA), key = listA.count)
print("Element with highest frequency:\n",res)
# 输出 45
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2. 法二：with Counter
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| from collections import Counter
# Given list
listA = [45, 20, 11, 50, 17, 45, 50,13, 45]
occurence_count = Counter(listA)
res=occurence_count.most_common(1)[0][0]
print("Element with highest frequency:\n",res)
# 输出 45
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3. 法三：with mode
返回众数
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| from statistics import mode
# Given list
listA = [45, 20, 11, 50, 17, 45, 50,13, 45]
res=mode(listA)
print("Element with highest frequency:\n",res)
# 输出 45
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补充：关于 Counter
将一个 list 传入 Counter，将返回一个包含每个元素出现次数的字典
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| from collections import Counter
# Given list
listA = [45, 20, 11, 50, 17, 45, 50,13, 45]
occurence_count = Counter(listA)
occurence_count.keys()
# dict_keys([45, 20, 11, 50, 17, 13])
occurence_count.values()
dict_values([3, 1, 1, 2, 1, 1])
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most_common([n])方法：
返回前n个出现次数最多的元素及其数量。
如果省略n或None，将返回计数器中的所有元素。
具有相同计数的元素可以任意排序
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| occurence_count.most_common(1)
# [(45, 3)]
occurence_count.most_common(2)
#[(45, 3), (50, 2)]
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