pip to pip3

[freeacetone]

Please follow the guide below

• You will be asked some questions, please read them carefully and answer honestly
• Put an x into all the boxes [ ] relevant to your pull request (like that [x])
• Use Preview tab to see how your pull request will actually look like

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Before submitting a pull request make sure you have:

• Searched the bugtracker for similar pull requests
• Read adding new extractor tutorial
• Read youtube-dl coding conventions and adjusted the code to meet them
• Covered the code with tests (note that PRs without tests will be REJECTED)
• Checked the code with flake8

In order to be accepted and merged into youtube-dl each piece of code must be in public domain or released under Unlicense. Check one of the following options:

• I am the original author of this code and I am willing to release it under Unlicense
• I am not the original author of this code but it is in public domain or released under Unlicense (provide reliable evidence)

What is the purpose of your pull request?

• Bug fix
• Improvement
• New extractor
• New feature

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Description of your pull request and other information

Explanation of your pull request in arbitrary form goes here. Please make sure the description explains the purpose and effect of your pull request and is worded well enough to be understood. Provide as much context and examples as possible.

[dirkf]

1. You've ignored the template.
2. Why would this be a good example for a user who doesn't have Python3?

[zulc22]

yeah, youtube-dl has support for python 2.

[mara004]

+1 as there is no point at recommending the use of ancient Python 2 stuff.
I think on the long term it would make sense to drop support for Python 2 at some point so youtube-dl can make use of modern Python 3 features and libraries, such as f-strings, type hints, yield from, pathlib, and so on. Python 2 really is deprecated.

[rautamiekka]

Note (source: official Python docs):

• F-strings require >=3.6.0 (but 3.8.0 would be optimal cuz >=3.7.0 allows using await expressions and comprehensions together with async for, and >=3.8.0 supports = to easily create debug prints showing the name+contents of a var). F-strings are very lovely and fast, but their realtime processing means they can only be used for strings which need to be created right now, while all templates need to use the somewhat slower str.format() way.
• type hints are truly useful >=3.9.0 due to many new features added since its introduction in 3.5.0, 1 being the standard types (list, tuple, ...) support being used directly as type hints instead of importing them from typing. Not the biggest problem if you use PyCharm or some other editor to warn you of lack of imported type hints being used, though. 3.9.1 introduced some new type hints, but I doubt those are gonna be used in yt-dl[p] anyway.
• yield from needs >=3.4.0 (which won't be a problem since 3.6.x has been the minimum for many projects, such as gallery-dl and yt-dlp).
• Same as above for pathlib (which according to/judging by https://treyhunner.com/2018/12/why-you-should-be-using-pathlib/ is a very nice alternative, even if it was only used for writing less code).