### El Problema

Entonces, ¿cuál es el problema de instalar paquetes en el entorno global de Python?

En algún momento, probablemente terminarás escribiendo muchos programas diferentes que dependen de **diferentes paquetes**. Y algunos de estos proyectos en los que trabajas dependerán de **diferentes versiones** del mismo paquete. 😱

### O Problema

Então, qual é o problema em instalar pacotes no ambiente global do Python?

Em algum momento, você provavelmente acabará escrevendo muitos programas diferentes que dependem de **pacotes diferentes**. E alguns desses projetos em que você trabalha dependerão de **versões diferentes** do mesmo pacote. 😱

* If you see the PR makes sense, or we discussed it and considered it should be accepted, you can add commits on top of the PR to tweak it, to add docs, tests, format, refactor, remove extra files, etc.
* Feel free to comment in the PR to ask for more information, to suggest changes, etc.
* Once you think the PR is ready, move it in the internal GitHub project for me to review it.

## FastAPI People PRs

 * requirement that existing callers already fulfill).
 *
 * Disclaimer: Part of the reason that callers are so well adapted to `Function<A, B>` may be that
 * that is how the signature looked even prior to this comment! So naturally any change can break
 * existing users, but it can't *fix* existing users because any users who needed
 * `Function<@Nullable A, @Nullable B>` already had to find a workaround. Still, there is a *ton* of

	paxGname    = "gname"
	paxMtime    = "mtime"
	paxAtime    = "atime"
	paxCtime    = "ctime"   // Removed from later revision of PAX spec, but was valid
	paxCharset  = "charset" // Currently unused
	paxComment  = "comment" // Currently unused

	paxSchilyXattr = "SCHILY.xattr."

	// Keywords for GNU sparse files in a PAX extended header.
	paxGNUSparse          = "GNU.sparse."
	paxGNUSparseNumBlocks = "GNU.sparse.numblocks"

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