count time in python

import time

start = time.time()
print("hello")
end = time.time()
print(end - start)

import time
start = time.process_time()
# your code here    
print(time.process_time() - start)

import time
t0= time.clock()
print("Hello")
t1 = time.clock() - t0
print("Time elapsed: ", t1) # CPU seconds elapsed (floating point)