Python __str__ & __repr__ & __cmp__

for (__str__), we going-see a example ...

And find who are working for ...

# !/usr/bin/python class Person (object):         def __init__ (self,name,gender):         = name        = genderif__name__'__main__'  :        = person ('Frank', page)    print p

See,the instance of (person) has a default method, just like (describe method) ...

It ' s called by Instance Self (Here,is p itself) ...

So,what It is name ...

Keep Read,you would find what's it is ...

#!/usr/bin/pythonclassPerson (object):def __init__(self,name,gender): Self.name=name Self.gender=Genderdef __str__(self):"""override the Object method"""        return 'Person object:%s,%d'%(Self.name,self.gender)if __name__=='__main__': P= Person ('Frank', 23)    PrintP

See,we got a totally different result ...

So,we know who is the method (__str__) ...

Okay,next we'll talk (__cmp__) inside method ...

#!/usr/bin/pythonclassStudent (object):def __init__(Self,name,score): Self.name=name Self.score=scoredef __str__(self):return '(%s:%s)'%(Self.name,self.score)__repr__=__str__    def __cmp__(self,s):ifSelf.score >S.score:return-1elifSelf.score <S.score:return1Else:            ifSelf.name <S.score:return-1elifSelf.name <S.name:return1Else:                return0if __name__=='__main__': L= [Student ('Tim', Student), ('Bob', Student), ('Alice', 99)]    PrintSorted (L)

Python __str__ & __repr__ & __cmp__