Lesson-03 | Class Level Attributes | [OOP in Python]

This is the lesson number 03 of the lesson series on Object Oriented Programming (OOP) in Python. It will be a complete course with the aim is to cover almost everything needed in Object Oriented Programming.
In this lesson we will talk about the class level attributes. We will see how different objects or instances can access class level attributes.

Link to complete playlist:

Lesson Code:

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*Review Questions of the Lesson*

1. At 01:10 , department attribute is accessed for two student objects and is returned correctly. Can we access it for class rather than a specific object? How will we do that?
2. If subject MOM is repeated in the original offSubjects list as:
offSubjects=['Mech','LA','ES','CP-II','MOM', 'MOM','Proj']
At 04:35 will MOM be added two time?

#OOP #ObjectOrientedProgramming #Python

[muhammadfaseehbinnaeem]

1. Yes, we can access it for class rather than a specific object. We will do it by using "Student.department".
2. At 04:35, MOM will not be added two time because of the following condition we used in "registerSubject" function:
"s not in self.courses"

[rotrose]

I know I need to follow the correct sequence, but my current task forces me to learn from oop first.
Everytime I learn a lesson from you, it will quickly become another real-world solution tomorrow.
Thank you very much!

[Astromoola]

Nice lecture as usual...keep on uploading more...thank u...

[ayeshaaslam]

1- department is class attribute (which is accessible to every object and class ).
yes it can be access for class as well
class student:
department="mecha"

print(student.department) ### output : mecha

2-If subject MOM is repeated in the original offSubjects list as:
offSubjects=['Mech', 'LA', 'ES', 'CP-II', 'MOM', 'MOM', 'Proj']
it will not added two time to list of registered_subjects because we have put condition (not to add already existing subject).
Due to which MOM will be added once.

[LearningOrbis]

*Review Questions of the lesson:*
1. At 01:10, department attribute is accessed for two student objects and is returned correctly. Can we access it for class rather than a specific object? How will we do that?
2. If subject MOM is repeated in the original *offSubjects* list as:
offSubjects=['Mech', 'LA', 'ES', 'CP-II', 'MOM', 'MOM', 'Proj']
At 04:35 will *MOM* be added two time?

[abdurrehmansarwar]

1- Yes, we can access it as student.department for class. Actually, department is a class-level attribute and those attributes which are class level can be accessed in both ways, i.e. by class or by objects.

2- It will be added only once due to the if condition used in the for loop block. i.e,
for s in in sub:
if s in student.offsubjects and not in self.courses

[hamidiftikhar]

q1. Absolutely, we can access it for a class as well as for any instance because it is a class
level attribute. This is done by using 'Student.department'.

q2. No, MOM will not be added twice because of the condition inside the for loop(s not in self.courses).

[shahwarsadaqat]

1)It can be accessed by the "Student. department" because it is a class-level attribute.
2) The subject MOM can not be repeated twice because the condition says if the subject is already added to the list then it will not append for the second time.

[arfanisar]

1) Yes, department for class can also be accessed by simply writing "print(Student.department)".
2) No, MOM will not be added twice as we have restricted it by the condition that a subject will only be added to reg subjects list if it isn't already present in it.

[noorulain]

1- Yes, it is accessible via 'Student.department'.
2- No, it won't get added twice because the second 'if-and' condition prevents that from happening.

[zainulhassan]

...
1) Yes, department for class can also be accessed by simply writing "print(Student.department)".
2) No, MOM will not be added twice as we have restricted it by the condition that a subject will only be added to reg subjects list if it isn't already present in it.

[ahmadiftikhar]

1_Department is a class method so it can be accesed without creating an instance.
2_ it will not be added because of condition used in for loop.

[hafizaqib]

1)as class level attributes are accessible by any instance of class so department can be accessed by any instance and method of class. i.e Student.department
2) No, MOM will not be repeated in the original list because condition is applied on reg subject that will not allow repetition

[rajahaseebahmad]

1-Yes, we can use department attribute for class rather than a specific object . We can access it by "Student.department"
2-No, MOM will not be added two times, it will be added once and repetition of it will be discarded in the output because of the condition present in register subject function i.e., 's not in self.courses'

[wasifalii]

1.Yes we can access the department for any instance/object by Student.department as its a class level attribute.
2.No, MOM will not be added twice because of the condition used in registerSubject() method.

[muhammadalihadir]

1. Yes, an class attribute can also be accessed as a class. It can be done using Student.department
2. It will not be added twice because of if statement that filters out the possibility

[lostdiscoverer]

1. of course we can add it as a class attribute
2. in the absence of condition it would be two times but not in this situation

[hadiqarabnawaz]

yes, by using Student.department
no it won't be added twice because we've added an if condition that a subject can be registered only ONCE for a student.

[simplelife]

1) Yes we can access it because "department" is a class attribute.
2) It will not be added two times because we used the "if" condition for repetition.

[aurangzaibvirk]

1) yes we can do it by making it class attribute and call it as
Student.department