pip installI think that there are many cases where an ssl authentication error occurs when inserting a package with.

WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1091)'))': /v1/nc_2520839e1f9641b08211a5c85243124a/sudachi/SudachiDict_core-20190718.tar.gz
  WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1091)'))': /v1/nc_2520839e1f9641b08211a5c85243124a/sudachi/SudachiDict_core-20190718.tar.gz
  WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1091)'))': /v1/nc_2520839e1f9641b08211a5c85243124a/sudachi/SudachiDict_core-20190718.tar.gz
  WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1091)'))': /v1/nc_2520839e1f9641b08211a5c85243124a/sudachi/SudachiDict_core-20190718.tar.gz
  WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1091)'))': /v1/nc_2520839e1f9641b08211a5c85243124a/sudachi/SudachiDict_core-20190718.tar.gz
ERROR: Could not install packages due to an EnvironmentError: HTTPSConnectionPool(host='object-storage.tyo2.conoha.io', port=443): Max retries exceeded with url: /v1/nc_2520839e1f9641b08211a5c85243124a/sudachi/SudachiDict_core-20190718.tar.gz (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1091)')))

Like this.

If you download from the official website, you can solve it by forcibly trusting the domain of pipy's official website with the ``` --trusted-host ` `` option.

In particular···,

pip install --trusted-host pypi.org --trusted-host pypi.python.org --trusted-host files.pythonhosted.org <package name>

If you download the package from a non-official site, this is not enough

However, if you install from an unofficial site, this may not work (because the domain of that site has nothing to do with the pipy domain).

For example,

pip install https://object-storage.tyo2.conoha.io/v1/nc_2520839e1f9641b08211a5c85243124a/sudachi/SudachiDict_core-20190718.tar.gz

Obviously, if you want to install this package, you need to have the `` --trusted-host``` option trust the domain of the URL that represents the location of the package.

In the case of the above example, it is --trusted-host object-storage.tyo2.conoha.io.

It was a very simple story, but I'm quite addicted to it, so if you have the same eyes, please try it.

Well then.

Solution when pip install from other than the official website and SSL Error (SSL authentication error) occurs

If you download the package from a non-official site, this is not enough