Unresolved reference in Python class

Question

This is my code:

class robot:
    def __init__(givenName,givenColor):
        self.name=givenName//error
        self.color=givenColor//error
    def intro(self):
        print("my name izz "+self.name)

r1=robot();
r1.name='tom'
r1.color='red'

r2=robot();
r2.name='blue'
r2.color='blue'
r1.intro()
r2.intro()

I am getting an error in the above commented lines. I know this question has many answers on stackoverflow but none seems to work . the function calls self.color and self.color give the error.

jpp · Accepted Answer · 2018-04-18 11:56:53Z

2

The first argument of __init__ should be self:

def __init__(self, givenName, givenColor):
    self.name = givenName
    self.color = givenColor

Otherwise, your code will fail as self will not be accessible within the method.

You have 2 options to define attributes:

Option 1

Define at initialization with __init__ as above. For example:

r1 = robot('tom', 'red')

Option 2

Do not define at initialization, in which case these arguments must be optional:

class robot:
    def __init__(self, givenName='', givenColor=''):
        self.name=givenName
        self.color=givenColor
    def intro(self):
        print("my name izz "+self.name)

r1 = robot()

r1.givenName = 'tom'
r1.givenColor = 'red'

edited Apr 18, 2018 at 11:56

answered Apr 18, 2018 at 11:39

jpp

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2 Comments

Matias Cicero Over a year ago

Also, r1 = robot() will fail because it's expecting to receive 2 arguments, i.e. givenName and givenColor. You should be doing r1 = robot('tom', 'red') instead.

ravi tanwar Over a year ago

it worked. the first solution that included adding self at the beginning of the constructor worked.

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