Python编程 元组的创建

tu = ()
print(type(tu))  # <class 'tuple'>

tu1 = tuple()
print(type(tu1))  # <class 'tuple'>

tu2 = tuple("12345,")  # iterable
print(tu2)

# tu3 = tuple(123,)  # 注意：一定为可迭代对象，所以整数不可作为参数，会报错
# print(tu3)

tu4 = (123,)  # tuple 注意：以(,)这种方式创建，只有一个元素时记得跟上英文状态下逗号，否则会觉得就是普通小括号
print(tu4)

tu5 = (123)  # int
print(type(tu5))

 tu = tuple("12345")
 print(tu[1])    # '2'

 print(tu[2:4])  # ("3","4")


 tu1 = (1,2,3,4,5,5,5,4)
 print(tu1.count(5))  # 3
 print(tu1.index(5))  # 4


# tuple类型只有以上两种方法，那如果想实现反转以及排序，如何处理？
 tu2 = (3, 2, 5)
 print(tu2[::-1])
 print(tuple(reversed(tu2)))  # reversed:内置的反转类
 print(list(reversed(tu2)))   # reversed:内置的反转类

 print(sorted(tu2))             # 升序，返回list


 tu3 = (1, 2, 3)
 tu4 = (2, 2, 3)
 print(tu3 + tu4)       # 拼接
 print(tu3 * tu4)       # 不能元组与元组相乘
 print(tu3 * 2)           # 扩展