Question

python program

A line segment in one dimension is defined by an ordered pair of coordinates representing the left and right boundaries of the segment. Write a class Segment that implements the interface below, which includes testing whether a point is in a segment, and whether two segments overlap. Note that the constructor should raise an appropriate exception if it receives invalid input (left end is on the right of the right end). • __init__(): constructor that takes one or two arguments to build the segment. If only one value is given, it is assumed to be the coordinate of the right end, and the left end defaults to zero. Constructor raises an exception if left end is greater than right. • left(): returns coordinate of the left boundary • right(): returns coordinate of the right boundary • mid_point(): returns coordinate of the midpoint of the segment • contains(): takes a double argument x and returns a boolean indicating whether x is in the segment • overlaps(): takes a segment argument seg and returns a boolean indicating whether this segment and seg overlap • __lt__(): a less than method (<) that compares the midpoints of the segments • __str__(): returns a string representation of the segment (of the form [x0 – x1]) You should consider line segments to exclude the left endpoint x0 but include the right endpoint x1. The arguments to the constructor are ordered so that Segment(x0, x1) represents all points on the line in the half-closed interval (x0 x1]. Your code should be in a file called Segment.py, and should include a function that tests the methods of the Segment class. You have to think about and write an appropriate set of tests.

Answer 1

thanks for the question, here is the complete Segment class in python, I have written some of the test cases, you need to write some of the -ve test cases.

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class Segment():

    def __init__(self,right,left=0):
        if left>right:
            raise ValueError('Left coordinate value is greater than right coordinate value')
        self.right=right
        self.left=left

    def left(self):
        return self.left

    def right(self):
        return self.right

    def mid_point(self):
        return (self.left + self.right)/2

    def contains(self, x):
        return self.left<=x and x<=self.right

    def overlaps(self,seg):
        if self.left<seg.left and seg.left <self.right:
            return True
        elif self.left<seg.right and seg.right <self.right:
            return True
        else:
            return False

    def __lt__(self, other):
        return self.mid_point()<other.mid_point()

    def __str__(self):
        return '[{0} {1}]'.format(self.left,self.right)



def main():
    segment=Segment(9)
    print('Print Object ',segment)
    line =Segment(9,2)
    print('Is Segment<Line? ',segment<line)
    print(segment.mid_point(),line.mid_point())
    print('Does they Overlap? ',segment.overlaps(line))


main()

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