1. 问题：

•         怎样统计列表中元素出现次数？
•         怎样获得列表中元素出现次数排在前n的元素？
•         怎样汇总两个列表中元素出现次数的信息？

2. 解决方法：

        使用collections模块中的Counter函数。

• 示例：

import collections


demo_list = ["张共", "欣欣", "菲菲", "潇潇", "阿志", "吾知", "江红", "菲菲", "阿里", "吾知", "潇潇","吾知", "江红", "菲菲"]
demo_list_other = ["张共", "欣欣", "菲菲", "张共-江苏", "菲菲", "阿里", "吾知", "潇潇", "吾知", "江红", "菲菲"]

# 统计每个元素出现次数
counter = collections.Counter(demo_list)
print(f"demo_list列表中统计每个元素出现次数：{counter}")

counter_other = collections.Counter(demo_list_other)
print(f"demo_list_other列表中统计每个元素出现次数：{counter_other}")

# 筛选出现次数排在前3的元素
print(f"demo_list列表中元素出现次数排在前3的元素是：{counter.most_common(3)}")
print(f"demo_list_other列表中元素出现次数排在前3的元素是：{counter_other.most_common(3)}")

# 汇总两个列表元素出现次数
total_counter = counter + counter_other
print(f"demo_list列表和demo_list_other列表中元素次数汇总结果：{total_counter}")

• 示例结果：