Python 如何優雅的排序與去重

過載實現 __hash__方法和__eq__方法

函式原型:

def

__hash__
(self)
:return
[some hash value]
def__eq__
(self,other)
:#equality  
ifisinstance
(other,
[classname]):
#judge type is legal
return
[true
o***lse
]# do your judge there are equality ?
else
:return
false

過載實現 __cmp__方法

函式原型

def

__cmp__
(self ,other):if
isinstance
(other,
[classname]):
# do your judge and return -1 or 0 or 1
else
:raise exception(
"type error"
)return
0

import random

class
stu(
object):
def__init__
(self, stid=
0, stname="")
:        self.
id= stid
self.name = stname
def__eq__
(self, other):if
isinstance
(other, stu)
:# do your judge and return -1 or 0 or 1
return self.
id== other.
idelse
:return
false
def__hash__
(self)
:return
hash
(self.id)
def__cmp__
(self, other):if
isinstance
(other, stu)
:# do your judge and return -1 or 0 or 1
return self.
id.__cmp__(other.id)
else
:raise exception(
"type error"
)return
0def
__repr__
(self)
:return self.name +
"\'s id was:"
+str
(self.id)
+"\n"
stuset =
set(
)stulist =
for i in
range(0
,10):
# if you want use random plase import random first
temstu = stu(random.randint(1,
6),"bob"
+str
(random.randint(1,
4)))
stuset.add(temstu)
print
("the set was"
)print
(stuset)
print
("\n\nbefore sort list was:"
)print
(stulist)
stulist.sort(
)print
("after sort list was:"
)print
(stulist)

下面是執行結果:

set(

[bob3's id was:1
, bob2's id was:4
, bob4's id was:5
, bob1's id was:6])
before sort list was:
[bob2's id was:4
, bob3's id was:1
, bob4's id was:1
, bob1's id was:6
, bob2's id was:6
, bob3's id was:4
, bob2's id was:6
, bob2's id was:6
, bob4's id was:5
, bob3's id was:1
]after sort list was:
[bob3's id was:1
, bob4's id was:1
, bob3's id was:1
, bob2's id was:4
, bob3's id was:4
, bob4's id was:5
, bob1's id was:6
, bob2's id was:6
, bob2's id was:6
, bob2's id was:6
]

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