def run_test_is_parallel():
    ' Tests the   is_parallel   method of the Line class. '
    m1t.run_test_is_parallel()
    line1 = Line(Point(15, 30), Point(17, 50))
    line2 = Line(Point(10, 10), Point(15, 60))
    line3 = Line(Point(10, 10), Point(80, 80))
    line4 = Line(Point(10, 10), Point(10, 20))
    print(line1.is_parallel(line2))
    print(line2.is_parallel(line1))
    print(line1.is_parallel(line3))
    print(line1.is_parallel(line4))
    print(line1.is_parallel(line1))
    print(line4.is_parallel(line4))
    print('The above should print:')
    print('  True,  True,  False,  False,  True,  True')
Tests the   is_parallel   method of the Line class.
def run_test_is_parallel():
    '  '
    m1t.run_test_is_parallel()
    line1 = Line(Point(15, 30), Point(17, 50))
    line2 = Line(Point(10, 10), Point(15, 60))
    line3 = Line(Point(10, 10), Point(80, 80))
    line4 = Line(Point(10, 10), Point(10, 20))
    print(line1.is_parallel(line2))
    print(line2.is_parallel(line1))
    print(line1.is_parallel(line3))
    print(line1.is_parallel(line4))
    print(line1.is_parallel(line1))
    print(line4.is_parallel(line4))
    print('The above should print:')
    print('  True,  True,  False,  False,  True,  True')