字符串我已經作出了計劃,但我是越來越輸出輸出不打印在python
(<q3v3.Student instance at 0x023BB620>, 'is doing the following modules:', ' <q3v3.Module instance at 0x023BB670> <q3v3.Module instance at 0x023BB698>')
例如,上面的輸出應該給我愛麗絲做以下模塊:生物學,化學
幫助
這是我的全碼:
class Student :
def __init__(self,students):
self.students= students
print self.students
#def __str__(self): # when i used this i've got error type TypeError: __str__ returned non-string (type NoneType)
#print str(self.students)
class Module:
def __init__(self,modules):
self.modules = modules
print self.modules
#def __str__(self):
#print str(self.modules)
class Registrations (Student,Module):
def __init__(self):
self.list= []
self.stulist = []
self.modulist= []
def __iter__(self):
return iter(self.list)
def __str__(self):
return str(self.list)
def add(self,students,modules):
self.list.append((students,modules))
#print (self.list)
def students(self,modules):
for i in self.list:
if i[1] == modules:
self.modulist.append((i[0]))
return iter(self.modulist)
def __str__(self):
return str(self.students)
def modules(self,students):
for i in self.list:
if i[0] == students:
self.stulist.append((i[1]))
return iter(self.stulist)
def __str__(self):
return str(self.modules)
我需要導入我的程序能夠運行它這樣的:
from q3v4 import *
james = Student('james')
alice = Student('alice')
mary = Student('mary')
agm = Module('agm')
ipp = Module('ipp')
r = Registrations()
r.add(james,agm)
r.add(alice,agm)
r.add(alice,ipp)
mstr = ''
for m in map(str,r.modules(alice)):
mstr = mstr+' '+m
print(alice, 'is doing the following modules:', mstr)
sstr = ''
for s in map(str,r.students(agm)):
sstr = sstr+' '+s
print(agm, 'has the following students:', sstr)
print(r)
顯示您的代碼。 – mchfrnc
您是否爲'Student'和'Module'類定義了'__str__'方法? – Sinkingpoint
你的問題是非常unclaer :) – Chameleon