CODEWITHSUNDEEP
pythonclassdictionary
scriptkiddie
scriptkiddie

Reputation: 159

Python Class to Return a Dictionary

I researched online and still am having a hard time understanding how to create classes. The examples in SoloLearn, DataCamp, and other sites often use the Person / Employee example, such as this one:

class Person:

    def __init__(self, first, last):
        self.firstname = first
        self.lastname = last

    def Name(self):
        return self.firstname + " " + self.lastname

class Employee(Person):

    def __init__(self, first, last, staffnum):
        Person.__init__(self,first, last)
        self.staffnumber = staffnum

    def GetEmployee(self):
        return self.Name() + ", " +  self.staffnumber

x = Person("Marge", "Simpson")
y = Employee("Homer", "Simpson", "1007")

print(x.Name())
print(y.GetEmployee())

I am trying to create an example class that returns a dictionary by modifying it slightly. Here is the code:

 class Place:

    def __init__(self, country, province):
        self.country= country
        self.province = province

    def CountryState(self):
        return {
            'Province': self.province,
            'Country': self.country
            }

class Location(Place):

    def __init__(self, country, province, city, street, postal):
        super(Place, self).__init__(country, province, city, street, postal)
        self.city = city
        self.street = street
        self.postal = postal

    def GetLocation(self):
        return CountryState().update({
            'City': self.city,
            'Street': self.street,
            'Postal': self.postal
            })

if __name__=="__main__":

    x = Place('United States', "California")
    y = Location("United States", "California", "Los Angeles", "Johnson Street", "90007")

    print(x.CountryState())
    print(y.GetLocation())

I get a Traceback as follows using pdb.set_trace():

Traceback (most recent call last):
  File "/home/john/Python/class-example.py", line 37, in <module>
    y = Location("United States", "California", "Los Angeles", "Johnson Street", "90007")
  File "/home/john/Python/class-example.py", line 22, in __init__
    super(Place, self).__init__(country, province, city, street, postal)
TypeError: object.__init__() takes no parameters
> /usr/lib/python3.5/idlelib/run.py(370)runcode()
-> jit = self.rpchandler.console.getvar("<<toggle-jit-stack-viewer>>")

pdb list:

365                 self.usr_exc_info = sys.exc_info()
366                 if quitting:
367                     exit()
368                 # even print a user code SystemExit exception, continue
369                 print_exception()
370  ->             jit = self.rpchandler.console.getvar("<<toggle-jit-stack-viewer>>")
371                 if jit:
372                     self.rpchandler.interp.open_remote_stack_viewer()
373             else:
374                 flush_stdout()
375

I haven't been able to get __init__ to accept parameters. Please let me know what I am missing so I can return the dictionary from these lines:

print(x.CountryState())
print(y.GetLocation())

{ 'Country': 'United States', 'State': 'California' }

{ 'Country': 'United States', 'City': 'Los Angeles', 'Street':'Johnson Street', 'Postal Code': '90007'}

Upvotes: 0

Views: 3112

Answers (1)

blue note
blue note

Reputation: 29071

In the Location(Place) class you are calling

super(Place, self).__init__(country, province, city, street, postal)

You should call the super-class of the Location class. Now, you are calling the super class of Place. Since Place has no declared superclass, it derives from object class (which is the parent of all classes), and you are calling the object constructor, which takes no parameters.

Also, even if you fix that, you are giving more parameters than Place takes. The correct form would be

super(Location, self).__init__(country, province)

Upvotes: 1

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