how to repeat something in python ever second code example

Example 1: how to run a function in interval in python

# this makes program sleep in intervals
from time import time, sleep
while True:
    sleep(1 - time() % 1) # run every 1 second... you can change that
	# thing to run

Example 2: python repet x time

for i in range(50):
    print "Some thing"

Example 3: how to repeat code in python until a condition is met

a = 1
b = 1
while (a<10):
  print ('Iteration',a)
  a = a + 1
  b = b + 1
  if (b == 4):
    break
print ('While loop terminated')