How to Get Time of a Python Program'S Execution

How do I get time of a Python program's execution?

The simplest way in Python:

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

This assumes that your program takes at least a tenth of second to run.

Prints:

--- 0.764891862869 seconds ---

How to get the execution time of the code?

Contrary to other answers, I suggest using timeit, which was designed with the very purpose of measuring execution times in mind, and can also be used as a standalone tool: https://docs.python.org/3/library/timeit.html

It will give you not only the real time of execution, but also CPU time used, which is not necessarily the same thing.

How to know the execution time of a program

In C , just wrap your code with this code.You will get the execution time in seconds.

#include <time.h>
{
 clock_t start, end;
 double cpu_time_used;
 start = clock();

 /* Your Code */

 end = clock();
 cpu_time_used = ((double) (end - start)) / CLOCKS_PER_SEC;
 printf("The Execution Time In Seconds is : %lf",cpu_time_used);
}

How to measure time taken between lines of code in python?

If you want to measure CPU time, can use time.process_time() for Python 3.3 and above:

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

First call turns the timer on, and second call tells you how many seconds have elapsed.

There is also a function time.clock(), but it is deprecated since Python 3.3 and will be removed in Python 3.8.

There are better profiling tools like timeit and profile, however time.process_time() will measure the CPU time and this is what you're are asking about.

If you want to measure wall clock time instead, use time.time().

How do you calculate program run time in python?

You might want to take a look at the timeit module:

http://docs.python.org/library/timeit.html

or the profile module:

http://docs.python.org/library/profile.html

There are some additionally some nice tutorials here:

http://www.doughellmann.com/PyMOTW/profile/index.html

http://www.doughellmann.com/PyMOTW/timeit/index.html

And the time module also might come in handy, although I prefer the later two recommendations for benchmarking and profiling code performance:

http://docs.python.org/library/time.html

How do I get time of a Python program's execution?

The simplest way in Python:

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

This assumes that your program takes at least a tenth of second to run.

Prints:

--- 0.764891862869 seconds ---

To count a time of program execution that includes console input, in Python 3

try this code

import datetime

n = int(input())
a = list(map(int, input().split()))
start_time = datetime.now()
i = 1
k = 1
actions = 0
while i < n:
    if a[i] < a[i - 1]:
        actions = -1
        break
    elif a[i] == a[i - 1]:
        i += 1
        k += 1
    elif a[i] > a[i - 1]:
        for j in range(k):
            a[j] += 1
            j += 1
        actions += 1
print(actions)
print(datetime.now() - start_time)  # time consumed on run

Python - measure function execution time with decorator

Your function is running in 0.0001 something seconds. But since the number is so large, it takes almost 3 seconds to print it. So your code is working, I/O(print) is just slow. You can see it yourself if you only print the time it took.

To further demonstrate this and also add emil's comment

def decorator_timer(some_function):
    from time import time

    def wrapper(*args, **kwargs):
        t1 = time()
        result = some_function(*args, **kwargs)
        end = time()-t1
        return result, end
    return wrapper


@decorator_timer
def my_pow(a, b):
    res = a ** b
    return res
    # or just return a ** b, it doesn't really matter

result, exec_time = my_pow(99999 , 99999)
print(exec_time) # prints after 0.07347989082336426 seconds
print(result) # takes ~3 seconds

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