mCoding

What's faster, a for loop, a while loop, or something else?

We try several different ways to accomplish a looping task and discover which is fastest.

― mCoding with James Murphy (https://mcoding.io)

Source code: https://github.com/mCodingLLC/VideosSampleCode

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The Fastest Way to Loop in Python - An Unfortunate Truth

Python's favorite unexplained incantation!

Do you know def main if __name__ == '__main__'?  In this video I explain why your Python scripts should use this idiom. It's not strictly necessary, but you will be a better Python coder if you follow established conventions that improve the readability of your code.

― mCoding with James Murphy (https://mcoding.io)

Source code: https://github.com/mCodingLLC/VideosSampleCode
StackOverflow on the topic: https://stackoverflow.com/questions/419163/what-does-if-name-main-do
Python docs: https://docs.python.org/3/reference/toplevel_components.html#complete-python-programs

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Other donations: https://mcoding.io/donate

Top patrons and donors:
Jameson, John M, Laura M, Pieter G, Vahnekie, Sigmanificient

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CHAPTERS
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0:00 Intro
0:58 Dunder name
1:47 Why if name main
3:36 Why def main
4:59 Pickle example
5:42 Multiprocessing example
6:42 Main function entry point
7:07 Outro

You should put this in all your Python scripts | if __name__ == '__main__': ...

Nooby Python habits give away your inexperience.

Improve your code and your prestige just a bit by ditching those habits and doing things the Pythonic way.

CONTEST CLOSED! The winners are: Lluc Cardoner, David Saint, Gaurav Verma 1412, and Alpe!

OFFICIAL CONTEST RULES:
1. All entries must comply with the YouTube community guidelines ( http://www.youtube.com/t/community_guidelines) and YouTube Terms of Service (http://www.youtube.com/static?gl=US&template=terms). Entries that violate YouTube guidelines are automatically disqualified.
2. YouTube is not a sponsor of the contest and viewers are required to release YouTube from any liability related to the contest.
3. Privacy notice: no personal data will be collected for this contest.
4. In order to enter, you must (a) be one of my subscribers, AND (b) make a top-level comment to the video including #pycharm somewhere in the comment.
5. The contest is free, there is no fee required to enter.
6. Winners will be chosen randomly 1 week after the date the video went live from all users who have entered and not been disqualified.
7. Each winner will be notified via a comment reply from me that details what prize was won (e.g. "Congratulations! You have won XYZ. Please email me."). I will ask the winner to contact me by email, and I will reply through email with a random token which must be posted as another reply to the winning comment from the winning account in order to verify account ownership and prevent fraud.
8. Each winner will have 72 hours to respond AND prove account ownership or their prize is automatically forfeited and another winner will be chosen.
9. A winner can only win 1 prize per contest.
10. The prize pool for this contest is: 4 licenses for PyCharm Professional ("Free 1-Year Personal Subscription"), which is a product made by JetBrains. A prize consists of 1 license, which will be delivered in the form of a redeemable code that can be redeemed at https://www.jetbrains.com/store/redeem/ before May 01, 2022.
11. You may not enter the contest if doing so would be a violation of any relevant federal, state, and local laws, rules, and regulations, including U.S. sanctions.

― mCoding with James Murphy (https://mcoding.io)

Source code: https://github.com/mCodingLLC/VideosSampleCode

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Other donations: https://mcoding.io/donate

Top patrons and donors: Jameson, Laura M, Dragos C, Vahnekie, John Martin, Casey G, Pieter G, Krisztian M,  Mutual Information, Sigmanificient

BE ACTIVE IN MY COMMUNITY 😄
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25 nooby Python habits you need to ditch

Guido van Rossum said he would have never put this into Python.

If he had to make Python again, he would have never put for/else and while/else into the language. Why would a potentially useful feature that saves extra variables be seen as such a mistake? Find out in this video, where we see how for/else while/else work, where they came from, and why you should probably avoid them in your own professional Python code.

― mCoding with James Murphy (https://mcoding.io)

Source code: https://github.com/mCodingLLC/VideosSampleCode
Create custom lint rules: https://youtu.be/OjPT15y2EpE
Guido's 2009 opinion: https://mail.python.org/pipermail/python-ideas/2009-October/006157.html

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Other donations: https://mcoding.io/donate

Top patrons and donors: Jameson, Laura M, Vahnekie, Dragos C, Matt R, Casey G, Johan A, John Martin, Jason F, Mutual Information, Neel R

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Python's creator wishes this feature never existed

It's true, so why so many wrong proofs?

There are many incorrect proofs that .999... = 1 on YouTube and elsewhere. In this video we see why all those proofs are wrong, and then demystify what is actually meant when a mathematician says .999... = 1 and I explain why it is actually true. Did your favorite math creator make one of these mistakes?

*Title only applies before the first viewing of this video and only to people who have not studied real analysis.

― mCoding with James Murphy (https://mcoding.io)

References on the standard definition of decimals and repeating decimals (please read if you are confused or unsure about the standard notation):
https://www.math.utah.edu/~bertram/courses/4030/Reals.pdf
https://people.math.sc.edu/filaseta/gradcourses/Math785/Math785Notes1.pdf
https://www.ndsu.edu/pubweb/~comez/Decimal%20expansion.pdf
http://kevincarmody.com/math/repeatingdecimals.pdf
https://amsi.org.au/teacher_modules/pdfs/Real_numbers.pdf

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Every PROOF you've seen that .999... = 1 is WRONG

Get rid of boilerplate writing classes using dataclasses!

In this video we learn about dataclasses and how to use them, as well as the related attrs library that dataclasses were based on.

Note: As of Python 3.10 dataclasses DO support slots.

― mCoding with James Murphy (https://mcoding.io)

Source code: https://github.com/mCodingLLC/VideosSampleCode
attrs library: https://www.attrs.org/en/stable/examples.html

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Python dataclasses will save you HOURS, also featuring attrs

How many nooby C++ habits do you have?

Up your C++ skill by recognizing and ditching these nooby C++ habits. Post how many you fell for!

― mCoding with James Murphy (https://mcoding.io)

Source code: https://github.com/mCodingLLC/VideosSampleCode
C++ Core Guidelines: https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines

SUPPORT ME ⭐
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Patreon: https://patreon.com/mCoding
Paypal: https://www.paypal.com/donate/?hosted_button_id=VJY5SLZ8BJHEE
Other donations: https://mcoding.io/donate

Top patrons and donors: Jameson, Laura M, Dragos C, Vahnekie, John Martin, Casey G, Pieter G, Krisztian M,  Mutual Information, Sigmanificient

BE ACTIVE IN MY COMMUNITY 😄
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Github: https://github.com/mCodingLLC/
Reddit: https://www.reddit.com/r/mCoding/
Facebook: https://www.facebook.com/james.mcoding

CHAPTERS
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0:00 Intro
0:13 #1. using namespace std
0:42 #2. using std endl in a loop
0:55 #3. index based for when range-for fits better
1:10 #4. rewriting std algorithms
1:34 #5. using C array over std array
1:50 #6. any use of reinterpret cast
2:39 #7. casting away const
3:24 #8. not knowing map bracket inserts element
3:39 #9. ignoring const-correctness
3:59 #10. not knowing string literal lifetime
4:12 #11. not using structured bindings
4:47 #12. out-params instead of returning a struct
5:04 #13. not using constexpr
5:21 #14. forgetting to mark destructor virtual
6:10 #15. thinking class members init in order of init list
6:37 #16. not knowing about default vs value initialization
7:28 #17. MAGIC NUMBERS
7:41 #18. modifying a container while looping over it
8:30 #19. returning std move of a local
9:10 #20. thinking std move moves something
9:42 #21. thinking evaluation order is left to right
10:56 #22. unnecessary heap allocations
11:23 #23. not using unique ptr and shared ptr
12:11 #24. not using make unique and make shared
12:23 #25. any use of new and delete
12:52 #26. any manual resource management
13:24 #27. thinking raw pointers are bad
14:25 #28. using shared ptr when unique ptr would do
14:48 #29. thinking shared ptr is thread-safe
15:26 #30. mixing up const ptr vs ptr to const
16:00 #31. ignoring compiler warnings

31 nooby C++ habits you need to ditch

The most useful decorator in Python is @cache.

It's from the functools library (and a similar variant called @lru_cache too). This decorator was introduced in Python 3.9, but lru_cache has been available since 3.2. Often times, the cache decorator can be used to automatically do dynamic programming algorithms.

― mCoding with James Murphy (https://mcoding.io)

Source code: https://github.com/mCodingLLC/VideosSampleCode

SUPPORT ME ⭐
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Paypal: https://www.paypal.com/donate/?hosted_button_id=VJY5SLZ8BJHEE
Other donations: https://mcoding.io/donate

BE ACTIVE IN MY COMMUNITY 😄
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Reddit: https://www.reddit.com/r/mCoding/
Facebook: https://www.facebook.com/james.mcoding