How to change argument value in a running thread in python

How do I change a parameter of a function running in an infinite loop in a thread (python)? I am new to threading and python but this is what I want to do (simplified),

class myThread (threading.Thread):
   def __init__(self, i):
       threading.Thread.__init__(self)

   def run(i):
       self.blink(i)

   def blink(i):   
       if i!=0:
           if i==1:
               speed=0.10
           elif i==2:
               speed=0.20
           elif i==3:
               speed=0.30    

           while(true):
               print("speed\n")

i=3
blinkThread=myThread(i)
blinkThread.start()

while(i!=0):
i=input("Enter 0 to Exit or 1/2/3 to continue\n")
if i!=0:
   blinkThread.run(i)

Now, obviously this code gives errors regarding the run() method. I want to run the function blink() in infinite loop but change the 'i' variable. I also cannot do it without a thread because I have other portions of code which are doing parallel tasks. What can I do? Thanks!