[Tutor] python question

[Amir Fawzi]

Hi!

I am trying to do an exercise abt classes, but I find it really hard even after reading. I have tryed to start it at the bottom of this document. I hope someone can help me. I have to submit the question by sunday.  

Exercise 7.4. Make a class for straight lines.
Make a class Line whose constructor takes two points p1 and p2 (2-
tuples or 2-lists) as input. The line goes through these two points (see
function line in Chapter 3.1.7 for the relevant formula of the line). A
value(x) method computes a value on the line at the point x. Here is
a demo in an interactive session:

>>> from Line import Line
>>> line = Line((0,-1), (2,4))
>>> print line.value(0.5), line.value(0), line.value(1)
0.25 -1.0 1.5

My answer:

class Line:
    def __init__(self, p1, p2):
        self.p1 = p1
        self.p2 = p2
        
    def value(self, x):
    p1 = (y1 - y0)/float(x1 -x0)   # Formula referred to in chapter 3.1.7 in the book
        p2 = (y0 - a*x0)                   # return <value of the line at point x>
        

def line (x0, y0, x1, y1):
    p1 = (x0 - x1)
    p2 = (y0 - y1)
    return p1, p2



Kindest Regards
A.F.



 		 	   		  
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