方法在Python中查找列表中项的模式和出现次数？[副本]

Question

arr = [1,2,2,3,4,5]

Answer 1

要查找出现次数最多的项目以及它在列表中出现的次数，最有效和“Pythonic”的方法是什么？

使用collections.counter获得每个元素的dict值作为出现值，并使用most_common查找出现值最高的元素。试试看：

import collections

arr = [1,2,3,4,5,3]
counts = collections.Counter(arr)

print("Counter:", counts)
# counts.most_common()   # Returns all unique items and their counts
print("Most Occurred:", counts.most_common(1)[0][0])  # Returns the highest occurring item

输出：

Counter: Counter({3: 2, 1: 1, 2: 1, 4: 1, 5: 1})
Most Occurred: 3