python-元组方法（tulpe）知识

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# __author__:anxu.qi
# Date:2018/11/21

# 元组的特性，元组的元素不可被修改，元素的内部可以修改

################################## 元组 ###############################
# 元组和列表几乎是一样的，也是一组数，只不过他一旦创建，便不能再修改，所以又叫只读列表。
# 列表是可以进行修改的，元组是不能修改的

name_list = ("beijing","shanghai","jinan","shandong")
## 索引
print(name_list[0])
# beijing

## len
print(len(name_list))
# 4

## 切片
print(name_list[0:2])
# ('beijing', 'shanghai')

## for 循环
for i in name_list:
    print(i)
"""
beijing
shanghai
jinan
shandong
"""
################################## 删除元组元素报错 ###############################
name_list = ("beijing","shanghai","jinan","shandong")
# del name_list[0]
# TypeError: 'tuple' object doesn't support item deletion (说的是“tuple”对象不支持删除项)


################################## count 统计个数 ###############################
# def count(self, value):
# 统计元素个数
name_list = ("beijing","shanghai","jinan","shandong","beijing")
print(name_list.count("beijing"))
# 2


################################## index 获取索引 ###############################
# def index(self, value, start=None, stop=None):
# 获取指定元素的下标位置
name_list = ("beijing","shandong","shanghai","jinan","shandong")
print(name_list.index('shandong'))  # 获取的下标只能从左往右
# 1


################################## 元组 ###############################