1.合并两个字典

# 可以使用**符号来解压字典
def Merge(dict1, dict2):
    res = {**dict1, **dict2}
    return res


# 两个字典
dict1 = {"name": "Joy", "age": 25}
dict2 = {"name": "Joy", "city": "New York"}
dict3 = Merge(dict1, dict2)
print(dict3)

输出

{'name': 'Joy', 'age': 25, 'city': 'New York'}

2.检查文件是否存在

from os import path


def check_for_file():
    print("Does file exist:", path.exists("data.csv"))


if __name__ == "__main__":
    check_for_file()

输出

Does file exist: False

3.查找出现次数最多的元素(使用max方法找出列表中出现次数最多的元素。)

def most_frequent(list):
    return max(set(list), key=list.count)


mylist = [1, 1, 2, 3, 4, 5, 6, 6, 2, 2]
print("出现次数最多的元素是:", most_frequent(mylist))

输出

出现次数最多的元素是: 2

4.将两个列表转换为字典

def list_to_dictionary(keys, values):
    return dict(zip(keys, values))


list1 = [1, 2, 3]
list2 = ['one', 'two', 'three']

print(list_to_dictionary(list1, list2))

输出

{1: 'one', 2: 'two', 3: 'three'}

5.统计字频

from collections import Counter

result = Counter('banana')
print(result)

输出

Counter({'a': 3, 'n': 2, 'b': 1})