我有一个绘制 koch 雪花的 python 脚本。一切正常,除非我在绘图完成之前关闭 tutle 图形窗口,我得到一个很长的错误,最后一行:tkinter.tclerror:无效的命令名称“.38006576”。 我认为这就像在 java.swing 中:exit_on_close。这不是默认值。但是我还没有为python turtle找到类似的东西。 有什么建议可以避免这种情况吗?
import turtle
import sys
import easygui as eg
def isNum(s):
try:
int(s)
return True
except ValueError:
return False
run = True
while run:
msg = "Input"
title = "Koch snowflake"
fieldNames = ["Length","Depth"]
fieldValues = [] # we start with blanks for the values
fieldValues = eg.multenterbox(msg,title, fieldNames)
a=0
iterations=0
# make sure that none of the fields was left blank
while 1: # do forever, until we find acceptable values and break out
if fieldValues == None:
break
errmsg = ""
# look for errors in the returned values
for i in range(len(fieldNames)):
if fieldValues[i].strip() == "":
errmsg = errmsg + ('"%s" must be filled.\n\n' % fieldNames[i])
elif not (isNum(fieldValues[i].strip())):
errmsg = errmsg + ('"%s" requires a number.\n\n' % fieldNames[i])
if (isNum(fieldValues[1])):
if float(fieldValues[1].strip()) > 13:
errmsg = errmsg + ('Depth cannot be more than 13!')
if errmsg == "":
break # no problems found
else:
# show the box again, with the errmsg as the message
fieldValues = eg.multenterbox(errmsg, title, fieldNames, fieldValues)
#a=float(input("Length: "))
if not fieldValues == None:
if isNum(fieldValues[0]) and isNum(fieldValues[1]):
a=float(fieldValues[0])
iterations=int(fieldValues[1])
else:
sys.exit(0)
#turtle settings
turtle.bgcolor("black")
turtle.reset()
turtle.up()
turtle.setpos(-a*1.5 ,a)
turtle.down()
turtle.delay(0)
turtle.speed(0)
turtle.pencolor("white")
koch_flake = "EJEJE"
for i in range(iterations):
koch_flake = koch_flake.replace("E","EBEJEBE\n")
turtle.down()
for move in koch_flake:
if move == "E":
turtle.forward(a / (3 ** (iterations - 1)))
elif move == "B":
turtle.left(60)
elif move == "J":
turtle.right(120)
turtle.hideturtle()
image = "KochSnowflake.gif"
msg = "Run it again?"
title = "Please Confirm"
if eg.ynbox(msg, title,('Yes', 'No'),image): # show a Continue/Cancel dialog
run = True
else: # user chose Cancel
sys.exit(0)
最佳答案
在 Canvas
对象上绘制 turtle ,您可以从该对象访问 Tkinter 根。
捕获根的 WM_DELETE_WINDOW
事件。当事件被捕获时,del
turtle 对象,这样它就不能继续尝试绘制。控制 turtle 事件的线程将抛出 NameError,因为 turtle 已被删除。捕获 NameError 异常并忽略它。
这是执行此操作的代码。我测试过;它有效并且没有抛出任何错误:
import turtle
import Tkinter
import sys
import easygui as eg
def isNum(s):
try:
int(s)
return True
except ValueError:
return False
run = True
while run:
msg = "Input"
title = "Koch snowflake"
fieldNames = ["Length","Depth"]
fieldValues = [] # we start with blanks for the values
fieldValues = eg.multenterbox(msg,title, fieldNames)
a=0
iterations=0
# make sure that none of the fields was left blank
while 1: # do forever, until we find acceptable values and break out
if fieldValues == None:
break
errmsg = ""
# look for errors in the returned values
for i in range(len(fieldNames)):
if fieldValues[i].strip() == "":
errmsg = errmsg + ('"%s" must be filled.\n\n' % fieldNames[i])
elif not (isNum(fieldValues[i].strip())):
errmsg = errmsg + ('"%s" requires a number.\n\n' % fieldNames[i])
if (isNum(fieldValues[1])):
if float(fieldValues[1].strip()) > 13:
errmsg = errmsg + ('Depth cannot be more than 13!')
if errmsg == "":
break # no problems found
else:
# show the box again, with the errmsg as the message
fieldValues = eg.multenterbox(errmsg, title, fieldNames, fieldValues)
#a=float(input("Length: "))
if not fieldValues == None:
if isNum(fieldValues[0]) and isNum(fieldValues[1]):
a=float(fieldValues[0])
iterations=int(fieldValues[1])
else:
sys.exit(0)
root = Tkinter.Tk()
cv = turtle.Canvas(root, width=200, height=200)
cv.pack()
screen = turtle.TurtleScreen(cv)
screen.bgcolor("black")
myturtle = turtle.RawTurtle(screen)
def lastAction():
global myturtle
del myturtle
root.destroy()
root.protocol('WM_DELETE_WINDOW', lastAction)
try:
#turtle settings
screen.bgcolor("black")
myturtle.reset()
myturtle.up()
myturtle.setpos(-a*1.5 ,a)
myturtle.down()
turtle.delay(0)
myturtle.speed(0)
myturtle.pencolor("white")
koch_flake = "EJEJE"
for i in range(iterations):
koch_flake = koch_flake.replace("E","EBEJEBE\n")
myturtle.down()
for move in koch_flake:
if move == "E":
myturtle.forward(a / (3 ** (iterations - 1)))
elif move == "B":
myturtle.left(60)
elif move == "J":
myturtle.right(120)
myturtle.hideturtle()
except NameError:
pass
image = "KochSnowflake.gif"
msg = "Run it again?"
title = "Please Confirm"
if eg.ynbox(msg, title,('Yes', 'No'),image): # show a Continue/Cancel dialog
run = True
else: # user chose Cancel
sys.exit(0)
关于python - 在完成绘制之前关闭 python turtle 时获取 tkinter.tclerror,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/15588583/