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Metaclasses customize the class creation process. We go over what metaclasses are and give some notable examples, including: abstract base classes, adding function overloads, and dataclasses or code generation. CONTEST WINNERS (CONTEST ENDED 10/9/21) : PyCharm: Yannick Kuhn, peter duffy CLion: BalkanSwine, Laurin Neff 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 or #clion or both. If you only include one you will only have a chance to win that corresponding license. 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: 2 licenses for PyCharm Professional ("Free 1-Year Personal Subscription") and 2 licenses for CLion ("Free 1-Year Personal Subscription"), which are products 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 Python metaclass docs: https://docs.python.org/3/reference/datamodel.html#metaclasses Previous video on new: https://www.youtube.com/watch?v=-zsV0_QrfTw Another great metaprogramming video: https://www.youtube.com/watch?v=sPiWg5jSoZI Python descriptor docs: https://docs.python.org/3/howto/descriptor.html Python ABC docs: https://docs.python.org/3/library/abc.html SUPPORT ME ⭐ --------------------------------------------------- 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, John Martin, Dragos C, Vahnekie, Pieter G, Casey G, Sigmanificient BE ACTIVE IN MY COMMUNITY 😄 --------------------------------------------------- Discord: https://discord.gg/Ye9yJtZQuN Github: https://github.com/mCodingLLC/ Reddit: https://www.reddit.com/r/mCoding/ Facebook: https://www.facebook.com/james.mcoding CHAPTERS --------------------------------------------------- 0:00 Intro 1:28 What is a metaclass 3:58 Simplest possible metaclass 4:59 Load time metaclass 6:08 Abstract base classes 8:03 Function overloads 14:10 Dataclass code generation 15:01 Giveaway instructions