运算符

str1 = 'aa'str2 = 'bb'list1 = [1, 2]list2 = [11, 22]t1 = (1, 2)t2 = (11, 22)dict1 = {'name', 'Python/ target=_blank class=infotextkey>Python'}dict2 = {'age': 30}# + 合并print(str1 + str2)  # aabbprint(list1 + list2)  # [1, 2, 11, 22]print(t1 + t2)  # (1, 2, 11, 22)print(dict1 + dict2)  # 字典不支持

str1 = 'a'list1 = ['hello']t1 = ('world',)# *:复制print(str1 * 5)  # aaaaa# 打印10个-print('-' * 10)  # ----------print(list1 * 5)  # ['hello', 'hello', 'hello', 'hello', 'hello']print(t1 * 5)  # ('world', 'world', 'world', 'world', 'world')

len

str1 = 'asfasdfsd'list1 = [22, 3, 32, 31, 223]t1 = (12, 1, 2)s1 = {1, 2, 9, 4, 5, 6}dict1 = {'name': 'zs', 'age': 11}print(len(str1))  # 9print(len(list1))  # 5print(len(t1))  # 3print(len(s1))  # 6print(len(dict1))  # 2

del 或 del()

str1 = 'asfasdfsd'list1 = [22, 3, 32, 31, 223]t1 = (12, 1, 2)s1 = {1, 2, 9, 4, 5, 6}dict1 = {'name': 'zs', 'age': 11}# del str1# print(str1)  # NameError: name 'str1' is not defined# del(list1[1])# print(list1)  # [22, 32, 31, 223]# del(list1)# print(list1)  # NameError: name 'list1' is not defined# del s1# print(s1)  # NameError: name 's1' is not defined# del(dict1['age'])# print(dict1)  # {'name': 'zs'}## del dict1# print(dict1)  # NameError: name 'dict1' is not defined

max() 与 min()

str1 = 'asfasdfsd'list1 = [22, 3, 32, 31, 223]print(max(str1))  # sprint(min(str1))  # aprint(max(list1))  # 223print(min(list1))  # 3

range()

for i in range(1, 10, 1):    print(i)  # 1 2 3 4 5 6 7 8 9for i in range(1, 10, 2):    print(i)  # 1 3 5 7 9for i in range(10):    print(i)  # 0 1 2 3 4 5 6 7 8 9

enumerate()

enumerate(可遍历对象, start=0)

start参数用来设置遍历数据的下标的起始值，默认为0

list1 = ['a', 'b', 'c', 'd']# enumerate() 返回的结果是元组，元组第一个数据是原迭代对象的数据对应的下标，# 元组第二个数据是原迭代对象的数据for i in enumerate(list1):    print(i)# (0, 'a')# (1, 'b')# (2, 'c')# (3, 'd')for i in enumerate(list1, start=1):    print(i)# (1, 'a')# (2, 'b')# (3, 'c')# (4, 'd')

容器（数据）类型转换

• tuple()：将某个序列转为元祖
• list()：将某个序列转为列表
• set()：将某个序列转为集合

list1 = [1, 2, 3, 4, 5]s1 = {11, 22, 33, 44, 55}t1 = ('a', 'b', 'c', 'd', 'e')# tuple()：转为元组print(tuple(list1))  # (1, 2, 3, 4, 5)print(tuple(s1))  # (33, 11, 44, 22, 55)# list()：转为列表print(list(s1))  # [33, 11, 44, 22, 55]print(list(t1))  # ['a', 'b', 'c', 'd', 'e']# set()：转为集合print(set(list1))  # {1, 2, 3, 4, 5}print(set(t1))  # {'c', 'd', 'a', 'e', 'b'}