E1120:No value for argument in constructor call

Question

I'm pretty new to Python Classes, and I wanted to test a simple code:

class information:
  def __init__(self,fname,lname):
    self.fname = fname
    self.lname = lname
  def first(self):
    print ("First name :", self.fname)
  def last(self):
    print ("Last name :",self.lname)
firstname = information("Name")
lastname = information("Test")

However, Pylint gives me an error:

E1120:No value for argument 'lname' in constructor call (11,13)
E1120:No value for argument 'lname' in constructor call (12,12)

What's the problem here? I think I have defined lname as 'self.lname = lname"

Answer 1

__init__() is expecting two positional arguments, but one is given.

See your __init__():

def __init__(self,fname,lname):

You should create object of the class and use this object to call functions of the class, like so:

class information:

  def __init__(self,fname,lname):
    self.fname = fname
    self.lname = lname

  def first(self):
    print ("First name :", self.fname)

  def last(self):
    print ("Last name :",self.lname)

obj = information("Name", "Test")   # <-- see two arguments passed here.
firstname = obj.first()
lastname = obj.last()

# First name : Name
# Last name : Test

Note: When you create an object of a class, the class's constructor is automatically called. Arguments you pass while creating object must match with the number of arguments in the constructor.