Question

我的教授让我使用列表理解生成用户定义数量的龟对象，我无法弄清楚如何做到这一点。

import math
import turtle
import random

wn = turtle.Screen()
wn.setworldcoordinates(-300,-400,300,400)

wn.bgcolor('white')
num_of_turts = int(input("Enter the number of turtles to use: "))
turts = [turtle.Turtle() for t in range(num_of_turts)]:

wn.exitonclick()

这是一个开始，但由于'turtle.Turtle（）'而导致语法错误无效

有什么想法吗？

规格：

1.  Create a display area with coordinates in the range of a rectangle bounded by opposite diagonal corners at (-300, -400) and (300, 400).
2.  From user input, determine a number n of turtles to create.
3.  Use a list comprehension to create a list of n turtles
4.  With and for the bale of turtles:
    a.  Begin each turtle moving randomly within the display area. 
    b.  The turtles may be colored and color other than red or green. 
    c.  There must be a function to calculate a turtle’s next location. 
    d.  All turtles must remain in the display area.
5.  Create a red turtle and make its position match the average location of the other n turtles.
    a.  There must be a function to calculate and return the average location of the n turtles.
    b.  The red turtle must leave a pen trail
6.  Create a green turtle and make its position track exactly one of the current leftmost, rightmost, uppermost or bottommost turtle in the display. 
    a.  There must be a function to calculate and return the proper coordinate of the current, extreme-most turtle.
    b.  The green turtle must leave a pen trail.
    c.  Use the green turtle to draw a line the complete width or height of the display area at each extreme value of turtle location found for the bale. Use a horizontal line if tracking upper- or lower-most. Use a vertical line, if tracking left- or rightmost

Answer 1

你在行尾有一个冒号：

turts = [turtle.Turtle() for t in range(num_of_turts)]:

这在Python中无效。它应该是：

turts = [turtle.Turtle() for t in range(num_of_turts)]

除此之外，列表理解的语法还可以。

使用列表解析生成用户生成的龟对象数

1 个答案: