record time of an operation in python code example

Example 1: How to check how much time elapsed Python

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

Example 2: python how to measure code run in time

import time
start_time = time.time()
main()
print("--- %s seconds ---" % (time.time() - start_time))