Raspberry pi：如何从另一个文件运行Python文件

Question

I have one python code running (A.py) when the python code reach a specific point i must run (B.py) while A.py is still running on the background

A.py

count = 1
while True:
    count++
    if(count%20 == 0)
         //run b
    print "A is running"

B.py

  x = 0
  while x < 10
      print "B is running"

Answer must be like

A is running A is running ... 46 times repeat A is running A is running A is running B is running B is running A is running B is running A is running

A and b running does not have to be synchronized

Answer 1

import subprocess
count = 1
while True:
    count+=1
    if(count%20 == 0):
         subprocess.Popen("python B.py")
    print ("A is running")

Answer 2

if(count%20 == 0):
    execfile('B.py')