目录
21. 将字符串反转
s = "hello"
print(s[::-1])22. 计算字符串中的单词数
s = "hello world"
print(len(s.split()))23. 检查一个列表是否为空
lst = []
if not lst:
print("List is empty")
else:
print("List is not empty")24. 合并两个字典
dict1 = {'a': 1, 'b': 2}
dict2 = {'c': 3, 'd': 4}
merged_dict = {**dict1, **dict2}
print(merged_dict)25. 找到字典中的最大值
dict1 = {'a': 1, 'b': 2, 'c': 3}
print(max(dict1, key=dict1.get))