为python形状着色

Question

我试图让这个数字一路改变颜色，但我不知道我做错了什么。只画黑线，代码如下：

import turtle

colors = ["blue", "red", "yellow", "pink"]
NUM_LINES = 100

turtle.hideturtle()
turtle.speed(0)
colors = ["blue", "red", "yellow", "pink"]

for x in range(NUM_LINES):
  color = colors[x%4]
  turtle.left(90)
  turtle.forward(2+(4*x))

  for color in ['red', 'blue', 'brown', 'black']:

        turtle.pencolor(color)

Answer 1

您的内循环将笔的颜色从红色更改为蓝色、棕色、黑色，然后转到外循环的下一个线条绘制步骤。所以只能画黑线。您的color = colors[x%4]逻辑很好，因此请改用：

for x in range(NUM_LINES):
  color = colors[x%4]
  turtle.pencolor(color)
  turtle.left(90)
  turtle.forward(2+(4*x))

Answer 2

或者做下面的，有另一种风格的颜色：

for x in range(NUM_LINES):
  color = colors[x//25]
  turtle.left(90)
  turtle.forward(2+(4*x))
  turtle.pencolor(color)

---

import turtle

colors = ["blue", "red", "yellow", "pink"]
NUM_LINES = 100

turtle.hideturtle()
turtle.speed(0)
colors = ["blue", "red", "yellow", "pink"]


for x in range(NUM_LINES):
  color = colors[x//25]
  turtle.left(90)
  turtle.forward(2+(4*x))
  turtle.pencolor(color)

输出过程结束：