Calling class simple code

Question

class HouseLocation():

    def __init__(self,street_name,x,y):
        self.street_name=street_name
        self.x=x
        self.y=y

      def print_address():
          print '{}: {},{}'.format(street_name,x,y)

I assume the code is very simple and explains itself I would assume now my problem is when I try to run it

k=HouseLocation('lol lo', 3,7)

k.print_address()

I get the following error message

Traceback (most recent call last):

File "", line 1, in

k.print_address()

TypeError: print_address() takes no arguments (1 given)

Can someone please explain what I am doing wrong?

Methods are passed the object that owns them as the first parameter. By convention, we call this `self` in Python (but `def foobar_method(omg_its_me)` is syntactically valid). Note also that `street_name`, `x`, and `y` aren't defined inside `HouseLocation.print_address`. Since methods get their owners as the first argument, you get to use their attributes, but you have to refer to them as such! (`self.street_name`, `self.x`, `self.y`) — Adam Smith, Jan 11 '17 at 23:06

lukeg · Answer 1 · 2017-01-11T23:03:36.770

3

Remember that methods take the self argument implicitly. Change the method code to:

  def print_address(self):
      print '{}: {},{}'.format(self.street_name,self.x,self.y)

edited Jan 11 '17 at 23:03

answered Jan 11 '17 at 23:02

lukeg

4,189
3
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Upvoted because you also explained the _why_. – Christian Dean Jan 11 '17 at 23:03
1

@dana, yeah, forgot about that. Fixed now, thanks. – lukeg Jan 11 '17 at 23:05

esmit · Answer 2 · 2017-01-11T23:36:13.210

1

self is the missing parameter, which is passed as the first argument of all class methods.

def print_address(self):
    print '{}: {},{}'.format(self.street_name,self.x,self.y)

edited Jan 11 '17 at 23:36

answered Jan 11 '17 at 23:02

esmit

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ettanany · Answer 3 · 2017-01-11T23:08:09.970

1

You should pass self to print_address()

def print_address(self):
    print '{}: {},{}'.format(self.street_name, self.x, self.y)

edited Jan 11 '17 at 23:08

answered Jan 11 '17 at 23:02

ettanany

19,038
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dana · Accepted Answer · 2017-01-11T23:09:18.037

1

The first parameter of a function should be the self parameter. That is your instance of the class and allows you to get/set properties accordingly.

class HouseLocation():

    def __init__(self,street_name,x,y):
        self.street_name=street_name
        self.x=x
        self.y=y

    def print_address(self):
        print '{}: {},{}'.format(self.street_name,self.x,self.y)

edited Jan 11 '17 at 23:09

answered Jan 11 '17 at 23:02

dana

17,267
6
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score 1 · Answer 5 · answered Jan 11 '17 at 23:02

self is the missing parameter here. The function needs to have at least one argument where one of those is self whenever in a class:

def print_address(self):
      print '{}: {},{}'.format(self.street_name,self.x,self.y)

Then to avoid NameError, add self. in front of the variables.

Calling class *simple code*

5 Answers5

Calling class simple code