python unit2 list

>>> a=[1,2,3]

>>> b=a

>>> c=a[:]

>>> a

[1, 2, 3]

>>> b

[1, 2, 3]

>>> c

[1, 2, 3]

>>> a[0]=88

>>> a

[88, 2, 3]

>>> b

[88, 2, 3]

>>> c

[1, 2, 3]

>>> a[1]="this is s s "

>>> a

[88, 'this is s s ', 3]

>>> b

[88, 'this is s s ', 3]

>>> c

[1, 2, 3]

>>> a+b

[88, 'this is s s ', 3, 88, 'this is s s ', 3]

>>> a*5

[88,

'this is s s ',

3,

88,

'this is s s ',

3,

88,

'this is s s ',

3,

88,

'this is s s ',

3,

88,

'this is s s ',

3]

>>> 1 in a

False

>>> "thsi" in a

False

>>>

>>> del a[2]

>>> a

[88, 'this is s s ']

复制的例如 c=a[:] 改变a 但是c不变；同指向一个list的a与b，改变list后，都会改变；

索引，改变，置换，复制，加和，乘法，是否在里面，删减，