<p>links I find useful: </p>

<p><a href="https://stackoverflow.com/questions/136097/what-is-the-difference-between-staticmethod-and-classmethod-in-python">https://stackoverflow.com/questions/136097/what-is-the-difference-between-staticmethod-and-classmethod-in-python</a></p>

<p><a href="http://stackoverflow.com/questions/28277137/how-to-convert-datatypeobject-to-float64-in-python">http://stackoverflow.com/questions/28277137/how-to-convert-datatypeobject-to-float64-in-python</a></p>

<p><a href="http://stats.stackexchange.com/questions/31/what-is-the-meaning-of-p-values-and-t-values-in-statistical-tests">http://stats.stackexchange.com/questions/31/what-is-the-meaning-of-p-values-and-t-values-in-statistical-tests</a></p>

<p><a href="http://stackoverflow.com/questions/17530542/how-to-add-pandas-data-to-an-existing-csv-file">http://stackoverflow.com/questions/17530542/how-to-add-pandas-data-to-an-existing-csv-file</a></p>

<p><a href="http://stackoverflow.com/questions/13703720/converting-between-datetime-timestamp-and-datetime64">http://stackoverflow.com/questions/13703720/converting-between-datetime-timestamp-and-datetime64</a></p>

<p><a href="http://stats.stackexchange.com/questions/181/how-to-choose-the-number-of-hidden-layers-and-nodes-in-a-feedforward-neural-netw">http://stats.stackexchange.com/questions/181/how-to-choose-the-number-of-hidden-layers-and-nodes-in-a-feedforward-neural-netw</a></p>

<p><a href="http://stackoverflow.com/questions/3028642/regular-expression-for-letters-numbers-and">http://stackoverflow.com/questions/3028642/regular-expression-for-letters-numbers-and</a></p>

<p><a href="http://stackoverflow.com/questions/39492251/python-pandas-dataframe-rows-to-columns">http://stackoverflow.com/questions/39492251/python-pandas-dataframe-rows-to-columns</a></p>

<p><a href="http://stackoverflow.com/questions/40029996/pythonic-way-to-fill-bag-of-words">http://stackoverflow.com/questions/40029996/pythonic-way-to-fill-bag-of-words</a></p>

<p><a href="http://stackoverflow.com/questions/31884985/what-does-selecting-the-largest-eigenvalues-and-eigenvectors-in-the-covariance-m">http://stackoverflow.com/questions/31884985/what-does-selecting-the-largest-eigenvalues-and-eigenvectors-in-the-covariance-m</a></p>

<p><a href="https://en.wikipedia.org/wiki/Precision_and_recall" rel="nofollow noreferrer">https://en.wikipedia.org/wiki/Precision_and_recall</a></p>

<p><a href="http://stackoverflow.com/questions/25191620/creating-lowpass-filter-in-scipy-understanding-methods-and-units">http://stackoverflow.com/questions/25191620/creating-lowpass-filter-in-scipy-understanding-methods-and-units</a></p>

<p>git installing</p>

<p><a href="https://stackoverflow.com/questions/8247605/configuring-so-that-pip-install-can-work-from-github">https://stackoverflow.com/questions/8247605/configuring-so-that-pip-install-can-work-from-github</a></p>

<p><a href="https://stackoverflow.com/questions/20101834/pip-install-from-git-repo-branch">https://stackoverflow.com/questions/20101834/pip-install-from-git-repo-branch</a></p>

<p><a href="https://stackoverflow.com/questions/2281850/timeout-function-if-it-takes-too-long-to-finish/2282656#2282656">https://stackoverflow.com/questions/2281850/timeout-function-if-it-takes-too-long-to-finish/2282656#2282656</a></p>

<p><a href="https://stackoverflow.com/questions/14149422/using-pip-behind-a-proxy">https://stackoverflow.com/questions/14149422/using-pip-behind-a-proxy</a></p>

Mohammad Athar