How can I check the execution time of code in Python?

def function_to_test(n):
    for i in range(n):
        pass

import timeit
start = timeit.default_timer()

# Put the code to measure here
function_to_test(300000)


stop = timeit.default_timer()
print(stop - start)

import time
startTime = time.time()

# Execution Code

endTime = time.time() - startTime
print(endTime)