Cplex installation (for beginners)

[David Coudert]

Hello,

I'm posting this here as it may help improving the documentation of sage math and the install guide of Cplex.

A colleague (with very little system knowledge) just installed sagemath on his new macOS laptop using the  precompiled binary sage-9.1-OSX_10.15.4-x86_64.app.dmg.

He also installed Cplex Studio 12.10.

Then he followed the install guide of Cplex from https://github.com/mkoeppe/sage-numerical-backends-cplex and got the following error.

I don't know how to solve this issue.

Any help is more than welcome :))

Best,

David.

=====

aioli:~ nnisse$ sage -python -m pip install sage-numerical-backends-cplex

pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.

Collecting sage-numerical-backends-cplex

  Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /simple/sage-numerical-backends-cplex/

  Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /simple/sage-numerical-backends-cplex/

  Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /simple/sage-numerical-backends-cplex/

  Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /simple/sage-numerical-backends-cplex/

  Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /simple/sage-numerical-backends-cplex/

  Could not fetch URL https://pypi.org/simple/sage-numerical-backends-cplex/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/sage-numerical-backends-cplex/ (Caused by SSLError("Can't connect to HTTPS URL because the SSL module is not available.")) - skipping

  Could not find a version that satisfies the requirement sage-numerical-backends-cplex (from versions: )

No matching distribution found for sage-numerical-backends-cplex

pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.

Could not fetch URL https://pypi.org/simple/pip/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/pip/ (Caused by SSLError("Can't connect to HTTPS URL because the SSL module is not available.")) - skipping

=====

[Dima Pasechnik]

On Wed, Aug 26, 2020 at 5:10 PM David Coudert <david....@gmail.com> wrote:
>
> Hello,
>
> I'm posting this here as it may help improving the documentation of sage math and the install guide of Cplex.
>
> A colleague (with very little system knowledge) just installed sagemath on his new macOS laptop using the precompiled binary sage-9.1-OSX_10.15.4-x86_64.app.dmg.
> He also installed Cplex Studio 12.10.
> Then he followed the install guide of Cplex from https://github.com/mkoeppe/sage-numerical-backends-cplex and got the following error.
> I don't know how to solve this issue.
>
> Any help is more than welcome :))
>
> Best,
> David.
>
> =====
> aioli:~ nnisse$ sage -python -m pip install sage-numerical-backends-cplex
> pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

this is the 1st problem to fix, by doing
"sage -i openssl pyopenssl"
and crossing your fingers...

> Collecting sage-numerical-backends-cplex
> Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /simple/sage-numerical-backends-cplex/
> Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /simple/sage-numerical-backends-cplex/
> Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /simple/sage-numerical-backends-cplex/
> Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /simple/sage-numerical-backends-cplex/
> Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /simple/sage-numerical-backends-cplex/
> Could not fetch URL https://pypi.org/simple/sage-numerical-backends-cplex/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/sage-numerical-backends-cplex/ (Caused by SSLError("Can't connect to HTTPS URL because the SSL module is not available.")) - skipping
> Could not find a version that satisfies the requirement sage-numerical-backends-cplex (from versions: )
> No matching distribution found for sage-numerical-backends-cplex
> pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
> Could not fetch URL https://pypi.org/simple/pip/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/pip/ (Caused by SSLError("Can't connect to HTTPS URL because the SSL module is not available.")) - skipping
> =====
>

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[Zachary Scherr]

I think you need to run:

sage -i openssl

sage -f python3

and then you should be able to add packages through pip. 

[Dima Pasechnik]

On Wed, 26 Aug 2020, 21:49 Zachary Scherr, <zsc...@gmail.com> wrote:

I think you need to run:

sage -i openssl

sage -f python3

and then you should be able to add packages through pip. 

I would be surprised if this works on 

a machine without Xcode installed.

To view this discussion on the web visit https://groups.google.com/d/msgid/sage-devel/fbbc0b03-876b-42cb-bffd-1e0e8fa53e79n%40googlegroups.com.

[David Coudert]

Xcode and home-brew are installed on that machine

We'll try tomorrow and tell you the result.

Thanks.

[Matthias Koeppe]

This package is also prepared as an optional sage package.

"sage -i sage_numerical_backends_cplex" suffices. See https://doc.sagemath.org/html/en/thematic_tutorials/linear_programming.html#solvers-backends

[David Coudert]

"sage -i sage_numerical_backends_cplex" is working well. Thank you.

May be we should say that in the documentation of https://github.com/mkoeppe/sage-numerical-backends-cplex.

Best,

David.

[Matthias Koeppe]

On Thursday, August 27, 2020 at 4:44:07 AM UTC-7, David Coudert wrote:

"sage -i sage_numerical_backends_cplex" is working well. Thank you.

May be we should say that in the documentation of https://github.com/mkoeppe/sage-numerical-backends-cplex.

I have already updated the README there - please take a look  

[David Coudert]

Perfect. Thank you.