str1 = 'aa'
str2 = 'bb'

list1 = [1, 2]
list2 = [10, 20]

t1 = (1, 2)
t2 = (10, 20)

dict1 = {'name': 'Python'}
dict2 = {'age': 30}

# +: 合并
print(str1 + str2)
print(list1 + list2)
print(t1 + t2)

# print(dict1 + dict2)  # 报错：字典不支持合并运算




