Python程序，告诉您lin的斜率

Question

所以我是python新手，但已经成功地创建了一些程序，可以计算面积、体积、将摄氏度转换为华氏度等等。。。不过，我似乎对这个“直线斜率”程序有些问题。

# A simple program which prompts the user for two points 
# and then computes and prints the corresponding slope of a line.

# slope(S): (R*R)*(R*R) -> R
# If R*R is a pair of real numbers corresponding to a point,
# then slope(S) is the slope of a line.
def x1(A):
    def y1(B):
        def x2(C):
            def y2(D):
                def slope(S):
                    return (D-B)/(C-A)

# main
# Prompts the user for a pair of points, and then computes
# and prints the corresponding slope of the line.

def main():
    A = eval(input("Enter the value of x1:"))
    B = eval(input("Enter the value of y1:"))
    C = eval(input("Enter the value of x2:"))
    D = eval(input("Enter the value of y2:"))
    S = slope(S)
    print("The slope of a line created with those points\
 is: {}{:.2f}".format(S,A,B,C,D))

main()

Answer 1

slope函数可以是如下所示的函数-一个包含四个参数的函数，表示这两个点的四个坐标：

def slope(x1, y1, x2, y2):
    return (y1 - y2) / (x1 - x2)

但显然不应该这么简单，您必须改进它并考虑x1==x2的情况。