Python中的計數器列表

我寫了一個程序，它從列表中拉出一個隨機的座標/顏色集，並在圖形窗口中繪製一個圓。我希望它一旦至少繪製了一次每個座標/顏色集合，就立即到停止繪製圓圈。我還想記錄9個可能的座標/顏色集合中每一個的使用次數。我已經初始化了一個計數器，count = [0, 0, 0, 0, 0, 0, 0, 0, 0]，每次繪製新的圓時我都要打印一個計數器，並附加每個狀態的使用次數。如何做到這一點的提示？Python中的計數器列表

例輸出外殼：

count = [1, 0, 0, 0, 0, 0, 0, 0, 0] 
count = [2, 0, 0, 0, 0, 0, 0, 0, 0] 
count = [2, 1, 0, 0, 0, 0, 0, 0, 0] 
count = [2, 1, 0, 0, 1, 0, 0, 0, 0] 
count = [2, 1, 1, 0, 1, 0, 0, 0, 0] 
count = [2, 1, 1, 0, 1, 0, 0, 0, 1] 
count = [2, 1, 1, 0, 1, 0, 1, 0, 1] 
count = [2, 1, 1, 0, 1, 0, 1, 1, 1] 
count = [2, 1, 1, 1, 1, 0, 1, 1, 1] 
count = [2, 1, 1, 1, 1, 1, 1, 1, 1]

請和謝謝你在前進！

import random, turtle 

wn = turtle.Screen() 

alex = turtle.Turtle() 
alex.pensize(3) 
alex.color("black") 


def turtle_draw(): 
    '''draws a circle with given coordinates and in a 
given color, prints a counter.''' 

    color, place = random_state_finder() 
    alex.pu() 
    alex.goto(place) 
    alex.shape("circle") 
    alex.shapesize(3) 
    alex.fillcolor(color) 

    count = [0, 0, 0, 0, 0, 0, 0, 0, 0] 
    wn.ontimer(turtle_draw, 250) 

def random_state_finder(): 
    '''randomly generates a state number from 0 to 8 
and assigns the state's data to color and place.''' 

    rng = random.Random() 
    state_num = rng.randrange(0, 8) 

    L = [((-150, 150), "red"), ((0, 150), "orange"), 
       ((150, 150), "yellow"), ((-150, 0), "green"), 
       ((0, 0), "blue"), ((150, 0), "violet"), 
       ((-150, -150), "cyan"), ((0, -150), "magenta"), 
       ((-150, -150), "purple")] 

    random_state = L[state_num] 

    color = random_state[1] 
    place = random_state[0] 

    return color, place 

turtle_draw()

來源

2016-12-04 maio123maio

對於初學者來說，每次選擇狀態都需要更新'count';要做到這一點，它不能只在本地定義爲'turtle_draw'。 –

在某種程度上是很簡單的比你正在做的。關鍵是random.shuffle() - 只需將狀態列表混合一次，然後逐個瀏覽混洗列表。併發症是你count名單，這意味着我們實際上做的索引列表進入狀態列表和隨機索引列表，離開原來的狀態列出不變：

from turtle import Turtle, Screen 
from random import shuffle 

states = [((-150, 150), "red"), ((0, 150), "orange"), \ 
    ((150, 150), "yellow"), ((-150, 0), "green"), \ 
    ((0, 0), "blue"), ((150, 0), "violet"), \ 
    ((-150, -150), "cyan"), ((0, -150), "magenta"), \ 
    ((-150, -150), "purple")] 

def turtle_draw(): 
    ''' 
    draws a circle with given coordinates 
    and in a given color, prints a counter. 
    ''' 

    index = indexes.pop() 

    place, color = states[index] 
    alex.goto(place) 
    alex.fillcolor(color) 

    counts[index] += 1 
    print(counts) 

    if indexes: 
     screen.ontimer(turtle_draw, 250) 

counts = [0 for state in states] 

indexes = [i for i, state in enumerate(states)] # could also use list(range(len(states))) 

shuffle(indexes) 

screen = Screen() 

alex = Turtle(shape="circle", visible=False) 
alex.shapesize(3) 
alex.penup() 
alex.color("white") # don't want to see alex until first state 
alex.showturtle() 

turtle_draw() 

screen.exitonclick()

終端輸出

> python3 test.py 
[0, 0, 1, 0, 0, 0, 0, 0, 0] 
[0, 0, 1, 1, 0, 0, 0, 0, 0] 
[0, 0, 1, 1, 0, 0, 0, 1, 0] 
[1, 0, 1, 1, 0, 0, 0, 1, 0] 
[1, 0, 1, 1, 0, 0, 0, 1, 1] 
[1, 0, 1, 1, 0, 1, 0, 1, 1] 
[1, 0, 1, 1, 0, 1, 1, 1, 1] 
[1, 1, 1, 1, 0, 1, 1, 1, 1] 
[1, 1, 1, 1, 1, 1, 1, 1, 1] 
>

來源

2016-12-05 02:34:29 cdlane

Python中的計數器列表

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