TypeError: __init__() missing 3 required positional arguments

[Pythonhelp82]

Hi Guys,

I am studying a mark scheme answer from a previous exam question and when following the mark scheme on Python , I am presented with an error: TypeError: __init__() missing 3 required positional arguments: 'MemberName', 'MemberID', and 'SubscriptionPaid'

The focus is on practicing Methods:
methods
• SetMemberName
• SetMemberID
• SetSubscriptionPaid

I have played around with the code and used various methods to pass the arguments, unfortunately, still presented with this error.

Any help appreciated.

class Member() :
    def __init__(self, MemberName, MemberID, SubscriptionPaid):
        self.__MemberName = ""
        self.__MemberID = ""
        self.__SubscriptionPaid = False
    def SetMemberName(self, Name):
        self.MemberName = Name
    def SetMemberID(self, ID):
        self.MemberID = ID
    def SetSubscriptionPaid(self, Paid):
        self.SubscriptioPaid = Paid



class JuniorMember (Member):
    def __init__(self):
        super().__init__()
        self.DateOfBirth=""

    def SetDateOfBirth(self, Date):
        self.DateOfBirth = Date


NewMember=JuniorMember()
NewMember.SetMemberName("Ali")
NewMember.SetMemberID("12345")
NewMember.SetSubscriptionPaid(True)
NewMember.SetDateOfBirth("12/11/2001")

---

__init__ function of Member class has 3 arguments.

When I am calling super().__init__() from JuniorMember class I am passing 3 arguments now - but it says NameError: name 'MemberName' is not defined

super().__init__(MemberName, MemberID, SubscriptionPaid) 

[stullis]

You're receiving the error because super().__init__() is calling the __init__() of the parent, which requires three arguments which are not present. With your correction, the interpreter is giving you a new error because the variables you're passing haven't been defined in the scope of __init__() neither as a variable inside the function nor as an argument passed in.

To dummy out the arguments, do this:

class Member() :
    def __init__(self, MemberName, MemberID, SubscriptionPaid):
        self.__MemberName = ""
        self.__MemberID = ""
        self.__SubscriptionPaid = False
    def SetMemberName(self, Name):
        self.MemberName = Name
    def SetMemberID(self, ID):
        self.MemberID = ID
    def SetSubscriptionPaid(self, Paid):
        self.SubscriptioPaid = Paid
 
 
 
class JuniorMember (Member):
    def __init__(self):
        super().__init__("John Doe", "000000", False)
        self.DateOfBirth=""
 
    def SetDateOfBirth(self, Date):
        self.DateOfBirth = Date
 
 
NewMember=JuniorMember()
NewMember.SetMemberName("Ali")
NewMember.SetMemberID("12345")
NewMember.SetSubscriptionPaid(True)
NewMember.SetDateOfBirth("12/11/2001")

[DeaD_EyE]

This should work.

class JuniorMember(Member):
    def __init__(self, MemberName, MemberID, SubscriptionPaid):
        super().__init__(MemberName, MemberID, SubscriptionPaid)
        self.DateOfBirth = ""

PS: I forgot to hit the post button :-/

[snippsat]

It's Java written in Python,it's not your fault we see this often in education when have teacher that's come from a Java/C++ background.

Just to show how it could be written in more pythonic way.
Remove getters/setters and __(is not private,it's name mangling that's not needed here), PEP-8

class Member() :
    def __init__(self, member_name, member_id, subscription_paid):
        self.member_name = member_name
        self.member_id = member_id
        self.subscription_paid = subscription_paid

class JuniorMember (Member):
    def __init__(self,member_name, member_id, subscription_paid, date_of_birth):
        super().__init__(member_name, member_id, subscription_paid)
        self.date_of_birth = date_of_birth

Test usage:

>>> new_member = JuniorMember('Ali', 12345, True, "12/11/2001")
>>> new_member.member_name
'Ali'
>>> new_member.date_of_birth
'12/11/2001'.

>>> an_other_member = JuniorMember('Tom', 4444, True, "1/2/2018")
>>> an_other_member.member_id
4444
>>> an_other_member.subscription_paid
True

>>> regular_member = Member('Kent', 9999, True)
>>> regular_member.member_name
'Kent'

But i don't want to give all data at once,use getters/setter?
No it's simple attribute access,have to prove that need more that,if need more @property can be used.
Use default arguments.

def __init__(self,member_name='', member_id='', subscription_paid='', date_of_birth=''):

>>> new_member = JuniorMember()
>>> new_member.date_of_birth = '12/11/2001'
>>> new_member.date_of_birth
'12/11/2001'

[Pythonhelp82]

This should work.

class JuniorMember(Member):
    def __init__(self, MemberName, MemberID, SubscriptionPaid):
        super().__init__(MemberName, MemberID, SubscriptionPaid)
        self.DateOfBirth = ""

PS: I forgot to hit the post button :-/

I remember trying that too and it resulted in the same error:
TypeError: __init__() missing 3 required positional arguments: 'MemberName', 'MemberID', and 'SubscriptionPaid'

---

It's Java written in Python,it's not your fault we see this often in education when have teacher that's come from a Java/C++ background.

Just to show how it could be written in more pythonic way.
Remove getters/setters and __(is not private,it's name mangling that's not needed here), PEP-8

class Member() :
    def __init__(self, member_name, member_id, subscription_paid):
        self.member_name = member_name
        self.member_id = member_id
        self.subscription_paid = subscription_paid

class JuniorMember (Member):
    def __init__(self,member_name, member_id, subscription_paid, date_of_birth):
        super().__init__(member_name, member_id, subscription_paid)
        self.date_of_birth = date_of_birth

Test usage:

>>> new_member = JuniorMember('Ali', 12345, True, "12/11/2001")
>>> new_member.member_name
'Ali'
>>> new_member.date_of_birth
'12/11/2001'.

>>> an_other_member = JuniorMember('Tom', 4444, True, "1/2/2018")
>>> an_other_member.member_id
4444
>>> an_other_member.subscription_paid
True

>>> regular_member = Member('Kent', 9999, True)
>>> regular_member.member_name
'Kent'

But i don't want to give all data at once,use getters/setter?
No it's simple attribute access,have to prove that need more that,if need more @property can be used.
Use default arguments.

def __init__(self,member_name='', member_id='', subscription_paid='', date_of_birth=''):

>>> new_member = JuniorMember()
>>> new_member.date_of_birth = '12/11/2001'
>>> new_member.date_of_birth
'12/11/2001'

This is a fantastic break down and very useful for a beginner and something I will be using definitely, however, I think the purpose of the task is to demonstrate set methods:
• SetMemberName
• SetMemberID
• SetSubscriptionPaid

TypeError: __init__() missing 3 required positional arguments: 'MemberName', 'MemberID', and 'SubscriptionPaid'

[snippsat]

TypeError: __init__() missing 3 required positional arguments: 'MemberName', 'MemberID', and 'SubscriptionPaid'

As you have it now NewMember=JuniorMember('Ali', 4444, True)
Set default arguments,the can use it like this.

class JuniorMember(Member):
    def __init__(self, MemberName='', MemberID='', SubscriptionPaid=''):
        super().__init__(MemberName, MemberID, SubscriptionPaid)
        self.DateOfBirth = ""

    def SetDateOfBirth(self, Date):
        self.DateOfBirth = Date

Use:

>>> NewMember = JuniorMember()
>>> NewMember.SetMemberName("Ali")
>>> NewMember.SetMemberID("12345")
>>> NewMember.MemberID
'12345'
>>> NewMember.MemberName
'Ali'

[Pythonhelp82]

TypeError: __init__() missing 3 required positional arguments: 'MemberName', 'MemberID', and 'SubscriptionPaid'

As you have it now NewMember=JuniorMember('Ali', 4444, True)
Set default arguments,the can use it like this.

class JuniorMember(Member):
    def __init__(self, MemberName='', MemberID='', SubscriptionPaid=''):
        super().__init__(MemberName, MemberID, SubscriptionPaid)
        self.DateOfBirth = ""

    def SetDateOfBirth(self, Date):
        self.DateOfBirth = Date

Use:

>>> NewMember = JuniorMember()
>>> NewMember.SetMemberName("Ali")
>>> NewMember.SetMemberID("12345")
>>> NewMember.MemberID
'12345'
>>> NewMember.MemberName
'Ali'

Thank you so much in helping me understand and fix this programming problem.