df1 = pd.DataFrame([['张三', 10, '男'], ['李四', 11, '男'], ['王五', 11, '女'],['赵六', 10, '女'],['王七', 11, '男'],['Mike', 10, '男']], columns=['name', 'age', 'sex'])
df2 = pd.DataFrame([['Mike', 10, '男'], ['Jane', 11, '女'],['张三', 10, '男']],columns=['name', 'age', 'sex'])