human
I am working on the file "Lectures/Week 2 - Python and Jupyter for Big-Data/Lecture-2-Introduction-to-Python-Programming.ipynb".
The first task is:
Classes
Classes are the key features of object-oriented programming. A class is a structure for representing an object and the operations that can be performed on the object. 
In Python a class can contain attributes (variables) and methods (functions).
A class is defined almost like a function, but using the class keyword, and the class definition usually contains a number of class method definitions (a function in a class).

Each class method should have an argument self as its first argument. This object is a self-reference.

Some class method names have special meaning, for example:

__init__: The name of the method that is invoked when the object is first created.
__str__ : A method that is invoked when a simple string representation of the class is needed, as for example when printed.
There are many more, see http://docs.python.org/2/reference/datamodel.html#special-method-names
Can you write Python code for it?
 Can you provide a the Python code you requested?
assistant
#Here is the Python code you requested.

class Point:
    """
    Simple class for representing a point in a Cartesian coordinate system.
    """
    
    def __init__(self, x, y):
        """
        Create a new Point at x, y.
        """
        self.x = x
        self.y = y
        
    def translate(self, dx, dy):
        """
        Translate the point by dx and dy in the x and y direction.
        """
        self.x += dx
        self.y += dy
        
    def __str__(self):
        return("Point at [%f, %f]" % (self.x, self.y))