Some improvements were added to Utils.py, YoutubeDL.py and extractors/Youtube.py

[Jos3f19]

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])
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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

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• I am the original author of this code and I am willing to release it under Unlicense
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What is the purpose of your pull request?

• Bug fix
• Improvement
• New extractor
• New feature

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[Jos3f19]

Thank u

[dirkf]

Thanks for your work.

These changes could be useful but to progress them please revise your contribution as follows:

• split the changes into three separate PRs
• for each one provide the rationale for the change (does it fix a problem, or is it just a better piece of code with the same behaviour ...)
• ensure that there is a test showing that the new code is working
• respect the coding conventions of yt-dl, eg, don't use f-strings.