Tuples & Dictionaries

Tuple tuples

#只能初次赋值, cannot be changed and deleted

#支持切片

>>> A
(1, 2, 3, 4, 5, 6, 7, 8, 9)
>>> a [0:6:2]
(1, 3, 5)

Type ((1,)) #tuple

Type ((1)) # int

Tuples can do formatted output

>>> print ' This number%f '% (5)
This number 5.000000
>>> print ' integer%d '% (5)
Integer 5
>>> print ' character%s '% (' abc ')
Character ABC

Dictionary

>>> zidian={' April ': ' Student ', ' Wu ': ' Teacher '}
>>>
>>> for K, V in Zidian.items ():
... print ' key:%s value:%s '% (k,v)
...
Key:april value:student
Key:wu value:teacher. Keys.values #dic [key]

>>> Zidian
{' April ': ' Student ', ' Wu ': ' Teacher '}
>>> zidian[' zhang '] = ' teacher ' #字典可赋值
>>> Zidian
{' April ': ' Student ', ' Wu ': ' Teacher ', ' Zhang ': ' Teacher '}
>>> zidian[' zhang '] = ' mysql ' #字典的值可更改
>>> Zidian
{' April ': ' Student ', ' Wu ': ' Teacher ', ' Zhang ': ' MySQL '}
>>>
>>> del zidian[' Zhang ' #字典的值可删除
>>> Zidian
{' April ': ' Student ', ' Wu ': ' Teacher '}
>>> for I inZidian.keys ():
... print I
...
April
Wu
>>> for I inzidian.values ():
... print I
...
Student
Teacher

Tuples & Dictionaries