1.7 元组

将一组值打包到一个对象中，即在圆括号放入一组值！

1.7.1元组与列表的区别：

(1)元组与列表的相同之处：索引、切片、连接

(2)元组创建后无法修改它的内容，即无法替换、删除元素或插入元素

stock = ('GooG',100,490.10) #stock = 'GooG',100,490.10

address = ('ww.python.org',80)#address = 'ww.python.org',80

#person = (first_name, last_name, phone) #person = first_name, last_name, phone

#a = () #0元组

#b = (item, ) #1元组（注意随后的逗号）

#c = item, #1元组

#将元组解包为一组变量

#name,shares,price = stock

#host,port = address

#firt_name, last_name, phone = person

filename = "tuple.txt"

tuple = []#空列表

for line in (filename):

fields = line.split(",")

name = fields[0] #提取并转换每个字段

shares = int(fields[1])

price = float(fields[2])

stock = (name,share,price)#创建一个元组

tuple.append(stock)#将元组追加到列表中

print("tuple[%d]" %line)