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Python Object-Oriented Python Instant Objects Your first method

Manuja Jayawardana
Manuja Jayawardana
1,450 Points

How can i get past this ?

Ive been stuck here it seems so simple i dont see whats wrong

first_class.py
class Student:
    name = "Manuja"
    def praise(self):
        return "Well Done %s"%self

name = Student()
Manuja Jayawardana
Manuja Jayawardana
1,450 Points

Whoops sorry, the question is - """ This class should look familiar! I need you to add a method name praise. The method should return a positive message about the student which includes the name attribute. As an example, it could say "You're doing a great job, Jacinta!" or "I really like your hair today, Michael!". Feel free to change the name attribute to your own name, too! """

8 Answers

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,423 Points

You are very close! Format the praise string with self.name

Manuja Jayawardana
Manuja Jayawardana
1,450 Points

Thank you! Could I ask why that's necessary when my variable is in fact "name"? Since I'm just replacing a placeholder, why is the "self" part necessary? Thank you so much!

Chris Freeman
Chris Freeman
Treehouse Moderator 68,423 Points

This is a more advanced question. If you donโ€™t understand the following, come back after classes have been covered in more detail.

When working with an instance of a class, the self points to the instance under consideration. To access the name attribute of this instance, the "dot" notation is used: self.name.

By using just "self" the format would try use the instance of Student. This fails because Student doesn't have a __str__ method to return a value when an instance of Student is used in a string context such as this formatting case.

There is a way just "self" would work, but you might not understand it until you cover magic methods. The following code would work if a __str__ method is added:

class Student:
    name = "Manuja"
    def praise(self):
        return "Well Done %s"%self
    def __str__(self):
        return self.name

In the above code, self is used in a text context, which cause a call to the instance __str__ method, which returns self.name. This value can successfully be used in the string format!

class Student:
    name = "Gerard"

    def praise(self):
        return("You're doing a great job {}".format(self.name))
Michael Moore
Michael Moore
7,121 Points

For anyone following the Python track, your answer is the best. We haven't covered the init or str stuff yet. +1, thanks. I was printing instead of returning, d'oh!

Your solution is more helpful than.... Chris almost got my brain f up

Chris Freeman
Chris Freeman
Treehouse Moderator 68,423 Points

If one just wants the answer without an understanding of why, a cut-and-paste solution will always seem better. ๐Ÿ‘

None of the above solutions passed for me. This was the one which passed and didn't use any functions/features we haven't learned yet:

class Student: /n name = "Your Name" /n def praise(self): /n
return "Well done {}!".format(self.name)

Dinu Sirbu
Dinu Sirbu
2,063 Points

Thanks for sharing your solution

class Student: name = "Pierre ilyamukuru" def praise(self): return "You're doing a great job, {}!".format(self.name)

this is how i got it, def praises(self): name = "Tipsy" return "You're doing great{}!".format(self.name)

class Student:
    name = "Your Name"
    def __init__(self, name):
        self.name = name
        return("You are doing great, {}".format(name))

Would this not accomplish the same thing?

Chris Freeman
Chris Freeman
Treehouse Moderator 68,423 Points

The __init__ should not return a value. Running your code produces:

>>> s = Student("bob")
Traceback (most recent call last):
  File "<string>", line 7, in <module>
TypeError: __init__() should return None, not 'str'

And the praise method would still need to reference self.name

class Student: name = "Your Name" def init(self, name): self.name = name return("You are doing great, {}".format(name))

me = Student()

Mercedes Aker
Mercedes Aker
6,544 Points

class Student: name = "Sadie"

def praise(self): return "Well Done!, {}!".format(self.name) def str(self): self.name

Anyone see the problem here?