python不常用, 出了岔子, 想將幾個實體轉成json, 但是因為實體列表裡的實體裡面套實體列表…直接使用json.dumps(obj)會出現一些錯誤, 只能給裡面的列表新增的時候呼叫object.__dict__, 但是外層使用object.__dict__就會報錯, 很迷, 大概就是裡面的元素無法序列化, 或者是某乙個屬性無法找到對應的"key".
# 其實這麼寫就可以了=.=
json.dumps(obj=self.students,
default=
lambda x : x.__dict__, sort_keys=
false
, indent=
2)
import json
class
course
:def
__init__
(self, coursenum, coursename, coursecredit)
: self.coursenum = coursenum
self.coursename = coursename
self.coursecredit = coursecredit
class
student
:def
__init__
(self, studentnum, studentname,
*courses)
: self.studentnum = studentnum
self.studentname = studentname
self.courses =
self.courses += courses
class
istudentresp
(object):
defaddstudent
(self, student)
:pass
defselectstudent
(self, studentnum)
:pass
defdeletestudent
(self, studentnum)
:pass
defaddcourse
(self, studentnum, course)
:pass
defselectcourse
(self, studentnum, coursenum)
:pass
defdeletecourse
(self, studentnum, coursenum)
:pass
class
studentresp
(istudentresp)
: students =
def__init__
(self)
:pass
defaddstudent
(self, student)
:def
selectstudent
(self, studentnum)
:for stu in self.students:
if studentnum == stu.studentnum:
return stu
defdeletestudent
(self, studentnum)
: self.students.remove(self.selectstudent(studentnum)
)def
addcourse
(self, studentnum, course)
: self.selectstudent(studentnum)
defselectcourse
(self, studentnum, coursenum)
:for stu in self.students:
if stu.studentnum == studentnum:
for course in stu.courses:
if course.coursenum == coursenum:
return course
defdeletecourse
(self, studentnum, coursenum)
: self.selectstudent(studentnum)
.courses\
.remove(self.selectcourse(studentnum, coursenum)
)def
show
(self)
:print
(json.dumps(obj=self.students,
default=
lambda x : x.__dict__, sort_keys=
false
, indent=2)
)# print(json.dumps(self.students))
if __name__ ==
"__main__"
: sp = studentresp(
) sp.addstudent(student(
"001"
,"001"
, course(
"a",
"a",2)
, course(
"a",
"a",2)
))sp.addstudent(student(
"002"
,"001"
, course(
"a",
"a",2)
, course(
"a",
"a",2)
))sp.addstudent(student(
"003"
,"001"
, course(
"a",
"a",2)
, course(
"a",
"a",2)
))sp.addstudent(student(
"004"
,"001"
, course(
"a",
"a",2)
, course(
"a",
"a",2)
))sp.addcourse(
"001"
, course(
"a",
"a",2)
) sp.addcourse(
"001"
, course(
"a",
"a",2)
) sp.addcourse(
"001"
, course(
"a",
"a",2)
) sp.addcourse(
"001"
, course(
"a",
"a",2)
) sp.show(
)
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