Python Programming Using Problem Solving by H. Bhasin

Author:H. Bhasin [Oswald Campesato]
Language: eng
Format: epub
ISBN: 9781683928621
Publisher: David Pallai
Published: 2023-07-15T00:00:00+00:00

============ RUN C:/Python/Class/Constructor2.py ===============

Name :Naved

Age :32

>>>

12.7 MULTIPLE __INIT__(s)

Having the same name function in a class, with different number of parameters, or different types of parameters, is called function overloading. In C++, JAVA, C#, etc., the constructors can also be overloaded; one can have more than one constructor, each having different parameters. In Python, however, we cannot have more than one __init__ in a class. For example, an error crops up if we try executing the following code.

Note, that if one makes a parameterized __init__, Python looks for the rest of the parameters in the instantiation.

Code:

class employee:

   def getdata(self):

      self.name=input('Enter name :')

      self.age=input('Enter age :')

   def putdata(self):

      print('Name :',self.name)

      print('Age :',self.age)

   def __init__(self, name, age):

      self.name=name

self.age=age

e1= employee()

e1.getdata()

e1.putdata()

e2=employee('Naved', 32)

e2.putdata()

>>>

============== RUN C:/Python/Class/Constructor2.py =============

Traceback (most recent call last):

   File "C:/Python/Class/Constructor2.py", line 11, in <module>

    e1=employee()

TypeError: __init__() missing 2 required positional arguments: 'name' and 'age'

>>>

Having studied the importance and implementation of constructors, let us now implement a constructor; let us revisit the “movie” class, created above. The following code has a movie class, which contains a getdata() and putdata() function and __init__(self) for initializing the variables. Note that the object “m” does not call the getdata() function but just putdata(). The values assigned in the constructor are displayed.

Code:

class movie:

 def getdata(self):

   self.name=input('Enter name :')

   self.year=int(input('Enter year :'))

   self.genre=input('Enter genre :')

   self.director=input('Enter the name of the director :')

   self.producer=input('Enter the producer :')

    L=[]

    item=input('Enter the name of the actor :')

   L.append(item)

    choice=input('Press 'y' for more 'n' to quit')

   while(choice == "y"):

         item=input('Enter the name of the actor :')

      L.append(item)

         choice=input('Enter 'y' for more 'n' to quit')

self.actors=L

self.music_director=input('Enter the name of the music director :')

   def putdata(self):

      print('Name :',self.name)

      print('Year ',self.year)

      print('Genre :',self.genre)

      print('Director :',self.director)

      print('Producer :',self.producer)

      print('Music_director :',self.music_director)

      print('Actors :',self.actors)

   def __init__(self):

      self.name='Fault'

      self.year=2015

      self.genre='Drama'

      self.director='XYZ'

      self.producer='ABC'

      self.music_director='LMN'

      self.actors=['A1', 'A2', 'A3', 'A4']

m=movie()

#m.getdata()

m.putdata()

============= RUN C:\Python\Class\class_basic2.py ==============

Name    : Fault

Year     2015

Genre    : Drama

Director  : XYZ

Producer  : ABC

Music_director :LMN

Actors :['A1', 'A2', 'A3', 'A4']

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