Question

这里有新手。我正在尝试创建一个可以计算受控制的简单多边形区域的代码：用户输入角点的坐标，然后一旦用户输入＆＃34; STOP＆＃34;就会计算区域，给定他/她至少给了3个坐标;否则，会出现一条错误消息，提示他输入另一对x和y坐标，直到他至少给出3对。

当我尝试运行程序时，我总是收到此错误消息：您的程序出错：语法无效

然后变量v以红色突出显示。

是的，这是我的代码：

ans = "" 
sigma2 = 0.0
corner_counter = 1

u1 = float(input("\nx-coordinate of the first corner: "))
v1 = float(input("y-coordinate of the first corner: "))

pu = u1
pv = v1

print "Number of points given: ",corner_counter # just to check the number corners given

while ans != "STOP":

        ans = raw_input("Enter x-coordinate of the next corner or type 'STOP' to compute the area: ")

        if ans == "STOP":
                if corner_counter >= 3:
                    break

                else:
                    u = float(input("ERROR: Must enter at least three (3) corners to compute the area./nEnter x-coordinate of the next corner: ")
                    v = float(input("Enter y-coordinate: "))
                    sigma2 += ((pu * v) - (pv * u))
                    print "(%d * %d) - (%d * %d) =" %(pu, v, pv, u), (pu * v) - (pv * u)
                    print "Partial sum:", sigma2 # to check if the running sum agrees with the expected result
                    corner_counter += 1
                    continue
        else:
           u = float(ans)
           v = float(input("Enter y-coordinate: "))

                sigma2 += ((pu * v) - (pv * u))

                print "(%d * %d) - (%d * %d) =" %(pu, v, pv, u), (pu * v) - (pv * u)
                print "Partial sum:", sigma2 # to check if the running sum agrees with the expected result
                corner_counter += 1
                print "Number of points given: ", corner_counter # for checking purposes

        pu = u
        pv = v

print "(%d * %d) - (%d * %d) =" %(pu, v1, pv, u1), (pu * v1) - (pv * u1)
sigma2 += (u * v1) - (v * u1)
print "\nTOTAL SUM:", sigma2

# final output
print "\nThe area of the", corner_counter,"-sided polygon is", (abs(sigma2)/2), "square unit(s)."

我已经尝试过更改但似乎没有任何效果。

希望你能帮助我们。非常感谢！

python：使用坐标方法进行的哨兵控制区域计算

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