[Python] pip installation source, pip config command and pip installation package location and other related issues

Permanently add pip installation source

pip config set global.index-url --site https://pypi.tuna.tsinghua.edu.cn/simple

The following results can be obtained:

It can be seen that the configuration information is written into the pip.ini file, and this pip.ini is stored in the python installation path.
Open the configuration file and you will see:

[global]
index-url = https://pypi.tuna.tsinghua.edu.cn/simple

Obviously, it corresponds to golbal.index-url in the configuration parameters. (There is already a previously set global here)

Check the storage location of pip file

pip -v config list

Visible:

that is, in addition to the directory corresponding to "site", there are other directories that may store pip configuration files.

View the configuration method of pip config

pip config -help

It can be seen that the following [< file-option >] parameters are --global, –user, and –site, which correspond to the different directories above. And –user is the default location.

Usage:
  pip config [<file-option>] list
  pip config [<file-option>] [--editor <editor-path>] edit

  pip config [<file-option>] get name
  pip config [<file-option>] set name value
  pip config [<file-option>] unset name
  pip config [<file-option>] debug


Description:
  Manage local and global configuration.

  Subcommands:

  - list: List the active configuration (or from the file specified)
  - edit: Edit the configuration file in an editor
  - get: Get the value associated with name
  - set: Set the name=value
  - unset: Unset the value associated with name
  - debug: List the configuration files and values defined under them

  If none of --user, --global and --site are passed, a virtual
  environment configuration file is used if one is active and the file
  exists. Otherwise, all modifications happen on the to the user file by
  default.

Config Options:
  --editor <editor>           Editor to use to edit the file. Uses VISUAL or EDITOR environment variables if not provided.
  --global                    Use the system-wide configuration file only
  --user                      Use the user configuration file only
  --site                      Use the current environment configuration file only

General Options:
  -h, --help                  Show help.
  --isolated                  Run pip in an isolated mode, ignoring environment variables and user configuration.
  -v, --verbose               Give more output. Option is additive, and can be used up to 3 times.
  -V, --version               Show version and exit.
  -q, --quiet                 Give less output. Option is additive, and can be used up to 3 times (corresponding to WARNING, ERROR, and CRITICAL logging levels).
  --log <path>                Path to a verbose appending log.
  --no-input                  Disable prompting for input.
  --proxy <proxy>             Specify a proxy in the form [user:passwd@]proxy.server:port.
  --retries <retries>         Maximum number of retries each connection should attempt (default 5 times).
  --timeout <sec>             Set the socket timeout (default 15 seconds).
  --exists-action <action>    Default action when a path already exists: (s)witch, (i)gnore, (w)ipe, (b)ackup, (a)bort.
  --trusted-host <hostname>   Mark this host or host:port pair as trusted, even though it does not have valid or any HTTPS.
  --cert <path>               Path to alternate CA bundle.
  --client-cert <path>        Path to SSL client certificate, a single file containing the private key and the certificate in PEM format.
  --cache-dir <dir>           Store the cache data in <dir>.
  --no-cache-dir              Disable the cache.
  --disable-pip-version-check
                              Don't periodically check PyPI to determine whether a new version of pip is available for download. Implied with --no-index.
  --no-color                  Suppress colored output
  --no-python-version-warning
                              Silence deprecation warnings for upcoming unsupported Pythons.
  --use-feature <feature>     Enable new functionality, that may be backward incompatible.
  --use-deprecated <feature>  Enable deprecated functionality, that will be removed in the future.

Delete configuration information

pip config --user unset site.index-url
pip config --user globalsite.index-url

Delete sources added elsewhere

Check the default path of the installation package downloaded by pip

python -m site

be able to see:

among themUSER_BASEandUSER_SITEThis is the location of the installation package downloaded by pip. The directory does not yet exist at this time.

See how to change the installation location

python -m site -help

See:

So, go to D:\Program Files\Python39\lib\site.py to modify the configuration information and change
:

to a self-built directory:

in
USER_SITEUsed to store scripts or programs required to execute the downloaded installation package
USER_BASEThe download location of the installation package