Python学习第二篇之tuple

一、元组的值不能被修改

#!/usr/bin/python

tup =("a","b","c");
tup[1]=7

执行后出现如下错误：

Traceback (most recent call last):

File "C:\Program Files\Sublime Text 3\time.py", line 4, in <module>

tup[1]=7

TypeError: ‘tuple‘ object does not support item assignment

二、元组的元素不能单个删除，只能全部删除

#!/usr/bin/python

tup =("a","b","c");
del tup
print "After deleting tuple:\n"
print tup

执行结果：

After deleting tuple:

Traceback (most recent call last):

File "C:\Program Files\Sublime Text 3\time.py", line 6, in <module>

print tup

NameError: name ‘tup‘ is not defined

三、只有一个元素的元组圆括号必须有逗号，否则不会认为是元组

#!/usr/bin/python
tupleone=(1,)
print "tupleone is :",type(tupleone)
tupleoneerror=(1)
print "tupleanotherone is :",type(tupleoneerror)

执行结果;

tupleone is : <type ‘tuple‘>

tupleanotherone is : <type ‘int‘>

四、元组元素的拆分，定义变量

#!/usr/bin/python
myinfo=("jinhoward",30,"Male")
name,age,gender=myinfo
print "Name=",name
print "Age=",age
print "Gender=",gender

执行结果：

Name= jinhoward

Age= 30

Gender= Male