How can I configure my IPython notebook so it always shows the execution time as part of the output?

Question

Sometimes I execute a method that takes long to compute

In [1]:

long_running_invocation()

Out[1]:

Often I am interested in knowing how much time it took, so I have to write this:

In[2]:
    import time

    start = time.time()
    long_running_invocation()
    end = time.time()
    print end - start
Out[2]: 1024

Is there a way to configure my IPython notebook so that it automatically prints the execution time of every call I am making like in the following example?

In [1]:

long_running_invocation()

Out[1] (1.59s):

Answer 1

This ipython extension does what you want: https://github.com/cpcloud/ipython-autotime

load it by putting this at the top of your notebook:

%install_ext https://raw.github.com/cpcloud/ipython-autotime/master/autotime.py %load_ext autotime

Once loaded, every subsequent cell execution will include the time it took to execute as part of its output.

Answer 2

i haven't found a way to have every cell output the time it takes to execute the code, but instead of what you have, you can use cell magics: %time or %timeit

ipython cell magics