Question

我的龟是死的！他不会用我的循环画画。 nmbrOfSides正在返回3 BTW。关于我可能会忽略的任何暗示？

import turtle
counter = 0

def poly_side_calculation (student_number):
    sides = 3 + student_number % 3
    return sides ####function returns 3 when I enter student number



print("welcome to my TURTLE demonstration.\n")

studentNmbr = int(input("Please enter your student number to get started: " ))
print("Here are your choices for the color of your polygon. You can choose red, green,    blue, yellow, cyan, magenta, black or white.")
fill_color = input("Please enter the color that you would like your polygon to be: ")
poly_side_length = int(input("Please enter the length of your polygon side: "))

nmbrOfSides = poly_side_calculation(studentNmbr)
vertex_angle = 360 / nmbrOfSides

turtle.color("black", fill_color)
turtle.pensize(5)

turtle.showturtle()
turtle.pendown()
turtle.begin_fill()
turtle.setpos(-150,150)
while counter <= nmbrOfSides:
    turtle.forward = (poly_side_length)
    turtle.left = vertex_angle
    counter = counter + 1
turtle.end_fill()

Answer 1

turtle.forward = (poly_side_length)
turtle.left = vertex_angle

这不符合你的想法。您需要调用函数，而不是分配给它们：

turtle.forward(poly_side_length)
turtle.left(vertex_angle)

粗略地说，你告诉乌龟“前进50像素”而不是“前进50像素”，乌龟正在重新定义“前进”意味着而不是移动的概念。

Answer 2

Python从左到右评估方程，但有些操作优先（类似于PEMDAS）。

您的模数运算正在总和之前进行评估。尝试用括号计算它：

sides = (3 + student_number) % 3

student_number=0应该返回1

我的乌龟死了

2 个答案: