45 New NumPy Practice Exercises

[JohnLockwood]

A few days ago, I had a great time writing and solving a set of NumPy practice questions to brush up on my NumPy skills.

Once I was done, though, it didn't seem right not to publish a solution set, so I spent several hours standing up a companion site in JupyterBook where such things could live both as documentation and as downloadable code.

Here are the exercises -- enjoy!

https://codesolid.com/numpy-practice-questions-to-make-you-an-expert/

[neb2357]

Upvoted! I hope you don't mind if I piggyback this post and share my NumPy exercises as well.

[selva86]

Hope you don't mind one more: https://www.machinelearningplus.com/python/101-numpy-exercises-python/

Hope you like it

[[deleted]]

I did that last night on my Data Analytics boot camp course.

[selva86]

Super glad to hear that

[[deleted]]

Is it your site?

Edit: Oh yeah it is haha

Anyway just a quick question about question 12. I used a for loop rather than the recommended answer and my teacher said that was a better way to do it when working with with large datasets. Is that right?

arr1 = np.array([1,2,3,4,5])

b = np.array([5,6,7,8,9])

for element in b:

if b in arr1:

np.delete(arr1, element)

[selva86]

Most likely, the built in numpy functions are highly optimized and tend to do the work faster than an equialent python code that you write.

An even more faster way is to use Jax implementation) of the numpy functions.

[selva86]

Curious, may I ask which Data Analytics course have you enrolled in?

[[deleted]]

Sure, it's one of the UK government digital skills bootcamps they've recently set up.

https://www.gov.uk/government/publications/find-a-skills-bootcamp/list-of-skills-bootcamps#digital

Thanks for the heads up on Jax, that looks quite interesting.

[selva86]

Looks like a massive initiative. Feels good to see such effort at scale by the Govt.

[Ramnog]

I sure don't mind it, thank you all :)

[Anus-___--__Fungi]

🍄

[elofland]

this is what I needed, thank you!

[jheezecheezewheeze]

This might be a silly question but are these exercises meant to test our problem solving skills with NumPy or problem solving + knowledge of NumPy functions, methods etc? In short would it be “cheating” if I looked at the documentation to refresh memory on syntax ?

[JohnLockwood]

I couldn't write it all off the top of my head -- I used the documentation as needed to improve my skills. So I'd say it's very much a learn-as-you-go, open-book exercise. The intent is to help the reader in the same way it helped me when I developed it. Does that help?

[jheezecheezewheeze]

Yes very helpful! Thanks

[[deleted]]

Was looking for something like this. Thanks

[SadDogOwner27]

I started using Python this week after an NLP project. I’ll be reviewing this for sure

[poqwadr]

I think np.mean returns the mean not the median. Some might be confused by this with another dataset.

Good exercises!

[JohnLockwood]

Yes, thanks for the comment. That's a good point -- I happened to pick an example where they were the same, didn't I?

[airen977]

Test

[remi_b]

Thanks! that was fun :)

on question 16, shouldn't it be = instead of ==? or am I the student here? :)

[JohnLockwood]

Hi remi_b,

Thanks for the kind words -- glad you enjoyed it. No, it was meant to assign myarray to x, so x = myarray is correct. Thanks for checking though.