python相关list类中存类对象
python有关list类中存类对象我写了下列代码： 1 #!/usr/bin/python23 class AA:4def __init__(self,aa,bb):
python有关list类中存类对象
我写了下列代码：
1 #!/usr/bin/python
2
3 class AA:
4 def __init__(self,aa,bb):
5 self.aa = aa
6 self.bb = bb
7 def __str__(self):
8 return "#%s,%d#" % (self.aa,self.bb)
9 def __cmp__(self,other):
10 if self.aa > other.aa:
11 return 1
12 elif self.aa == other.aa:
13 return 0
14 else:
15 return -1
16 def __iter__(self):
17 return self
18
19
20 if "__main__" == __name__:
21 mylist = []
22 aa = AA("we",1)
23 print aa
24 mylist.append(aa)
25 bb = AA("as",10)
26 mylist.append(bb)
27 print mylist
打印时却提示 [<__main__.AA instance at 0x7f6893231440>, <__main__.AA instance at 0x7f6893231488>] 怎么打重载方法才能正常打印出list中的数据呢 python?list?print?
[解决办法]问题是你的“正常”指的是什么，这个就很正常了
你期望输出什么格式？
[解决办法]object.__repr__(self)
Called by the repr() built-in function and by string conversions (reverse quotes) to compute the “official” string representation of an object. If at all possible, this should look like a valid Python expression that could be used to recreate an object with the same value (given an appropriate environment). If this is not possible, a string of the form <...some useful description...> should be returned. The return value must be a string object. If a class defines __repr__() but not __str__(), then __repr__() is also used when an “informal” string representation of instances of that class is required.
This is typically used for debugging, so it is important that the representation is information-rich and unambiguous.
object.__str__(self)
Called by the str() built-in function and by the print statement to compute the “informal” string representation of an object. This differs from __repr__() in that it does not have to be a valid Python expression: a more convenient or concise representation may be used instead. The return value must be a string object.
[解决办法] #~ def __str__(self):
def __repr__(self):
return "#%s,%d#" % (self.aa,self.bb)
