NumPy Exercises for Data Analysis in Python

#1

Post by selva86 » Tue, Feb 27, 2018, 2:15 PM UTC

I compiled a list of numpy practice exercises related to data analysis. Might be helpful if you want to practice some data munging problems. Feedback welcome!

https://www.machinelearningplus.com/101-numpy-exercises-python/

NumPy Exercises for Data Analysis in Python
machinelearningplus.com

Re: NumPy Exercises for Data Analysis in Python

#2

Post by dotancohen » Tue, Feb 27, 2018, 6:07 PM UTC

After a quick peruse, about half the exercises included new material for me. Anybody learning NumPy would do good to review this. Bookmarked!

Re: NumPy Exercises for Data Analysis in Python

#3

Post by jofer » Tue, Feb 27, 2018, 6:36 PM UTC

This is very similar in spirit to https://github.com/rougier/numpy-100/blob/master/100%20Numpy.... In fact, now that I look at it a bit more, it seems like all of this post's examples are reworded versions of Nicolas Rougier's "numpy 100"...

Re: NumPy Exercises for Data Analysis in Python

#4

Post by selva86 » Tue, Feb 27, 2018, 7:11 PM UTC

jofer wrote: post #3

This is very similar in spirit to https://github.com/rougier/numpy-100/blob/master/100%20Numpy... . In fact, now that I look at it a bit more, it seems like all of this post's examples are reworded versions of Nicolas Rougier's "numpy 100"...

Look a little bit more, please.

Re: NumPy Exercises for Data Analysis in Python

#5

Post by jofer » Tue, Feb 27, 2018, 7:32 PM UTC

selva86 wrote: post #4

jofer wrote: post #3

This is very similar in spirit to https://github.com/rougier/numpy-100/blob/master/100%20Numpy... . In fact, now that I look at it a bit more, it seems like all of this post's examples are reworded versions of Nicolas Rougier's "numpy 100"...

Look a little bit more, please.

You're right. There's a fair number of original examples there as well. Still, there's a lot of overlap.

Re: NumPy Exercises for Data Analysis in Python

#6

Post by selva86 » Tue, Feb 27, 2018, 7:46 PM UTC

jofer wrote: post #5

selva86 wrote: post #4

Earlier quoted context omitted.

Look a little bit more, please.

You're right. There's a fair number of original examples there as well. Still, there's a lot of overlap.

Well, that's bound to happen when framing questions on the same topic.

Re: NumPy Exercises for Data Analysis in Python

#7

Post by 00ajcr » Tue, Feb 27, 2018, 7:52 PM UTC

There are some nice exercises here, good work.

For question 48 it might be simpler to just write

  np.sort(a)[-5:]

instead of using argsort() and then using fancy indexing. Better yet, use

  np.partition(a, kth=-5)[-5:]

which scales linearly with the size of the array.

Also, the one-hot encoding puzzle (51) would be more efficiently solved using

  (arr[:, None] == np.unique(arr)).view(np.int8)

In general, `for` loops over NumPy arrays should be avoided where at all possible.

Re: NumPy Exercises for Data Analysis in Python

#8

Post by amch » Tue, Feb 27, 2018, 7:52 PM UTC

Does anyone know of any similar resources for Pandas?

I've found the following to be quite helpful but would love to know if anyone knows of other resources in a similar vein: https://pandas.pydata.org/pandas-docs/stable/cookbook.html

Re: NumPy Exercises for Data Analysis in Python

#9

Post by 00ajcr » Tue, Feb 27, 2018, 7:59 PM UTC

amch wrote: post #8

Does anyone know of any similar resources for Pandas? I've found the following to be quite helpful but would love to know if anyone knows of other resources in a similar vein: https://pandas.pydata.org/pandas-docs/stable/cookbook.html

I started writing a '100-pandas-puzzles' set of exercises here: https://github.com/ajcr/100-pandas-puzzles

There's also pandas_exercises by Guilherme Samora (https://github.com/guipsamora/pandas_exercises) which is very good - it's split across multiple notebooks and is more extensive than my repo.

Re: NumPy Exercises for Data Analysis in Python

#10

Post by budadre75 » Tue, Feb 27, 2018, 8:04 PM UTC

anyone knows anything similar for matplotlib?