rt，main()和dtime()分别都能正常运行，但是都调用时就程序未响应？也没有报错？
```python
import turtle
import time
global h,m,s,hp,mp,sp,hs,ms,ss,hn,mn,sn
h,m,s=0,0,0
hs,ms,ss='','',''
h,m,s=map(int,input().split(":"))
hs=time.strftime('%H',time.gmtime())
ms=time.strftime('%M',time.gmtime())
ss=time.strftime('%S',time.gmtime())
hp,mp,sp=str(h),str(m),str(s)
turtle.tracer(False)
def drawgap():
turtle.pu()
turtle.fd(5)
turtle.pd()
def drawline(j):
drawgap()
if j==0:
turtle.pd()
else:
turtle.pu()
turtle.right(45)
turtle.fd(5*2**0.5)
turtle.left(45)
turtle.fd(90)
turtle.left(45)
turtle.fd(5*2**0.5)
turtle.left(90)
turtle.fd(5*2**0.5)
turtle.left(45)
turtle.fd(90)
turtle.left(45)
turtle.fd(5*2**0.5)
turtle.left(135)
turtle.pu()
turtle.fd(100)
drawgap()
turtle.left(90)
def drawnum(i):
drawline(0) if i in [2,3,4,5,6,8,9] else drawline(1)
drawline(0) if i in [0,1,2,3,4,7,8,9] else drawline(1)
drawline(0) if i in [0,2,3,5,6,7,8,9] else drawline(1)
drawline(0) if i in [0,4,5,6,8,9] else drawline(1)
turtle.right(90)
drawline(0) if i in [0,2,6,8] else drawline(1)
drawline(0) if i in [0,2,3,5,6,8,9] else drawline(1)
drawline(0) if i in [0,1,3,4,5,6,7,8,9] else drawline(1)
turtle.right(180)
turtle.pu()
turtle.fd(30)
def drawcircle(x,y):
turtle.pu()
turtle.goto(x,y)
turtle.pd()
turtle.circle(7,360)
def dtime():
global hp,mp,sp
while True:
hn=time.strftime('%H',time.gmtime())
mn=time.strftime('%M',time.gmtime())
sn=time.strftime('%S',time.gmtime())
if hp!=str(h-(int(hn)-int(hs))) or mp!=str(m-(int(mn)-int(ms))) or sp!=str(s-(int(sn)-int(ss))):
hp=str(h-(int(hn)-int(hs)))
mp=str(m-(int(mn)-int(ms)))
sp=str(s-(int(sn)-int(ss)))
while int(hp)==0 and int(mp)==0 and int(sp)==0:
break
def main():
turtle.setup(1200,400)
drawcircle(-180,10)
drawcircle(-180,-90)
drawcircle(170,10)
drawcircle(170,-90)
turtle.pu()
turtle.goto(-480,0)
for c in hp.zfill(2):
drawnum(eval(c))
turtle.pu()
turtle.goto(-130,0)
for c in mp.zfill(2):
drawnum(eval(c))
turtle.pu()
turtle.goto(220,0)
for c in sp.zfill(2):
drawnum(eval(c))
dtime()
main()