“python3.7” cannot be opened because the developer cannot be verified.

asked 2020-05-06 00:44:55 +0100

admitUser
11 ●1 ●1 ●3

updated 2020-05-06 00:53:58 +0100

I am in the process of installing SageMath version 9.0 (Release Date: 2020-01-01), on a Mac, running Catalina Version 10.15.3, via dmg. When I run sage (via a terminal), I get the message

“python3.7” cannot be opened because the developer cannot be verified.

I cannot progress past this point. (The usual tricks, like "hold option when opening a program", do not work here, since I am running Sage from a terminal.)

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Welcome to Ask Sage! Thank you for your question!

slelievre ( 2020-05-06 00:56:03 +0100 )edit

Sadly Apple is making everybody's life a little harder with every release of macOS...

I put some links in an answer as they would not fit in a comment.

slelievre ( 2020-05-06 00:56:48 +0100 )edit

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answered 2020-05-06 00:55:28 +0100

slelievre
17704 ●22 ●160 ●350 http://carva.org/samue...

Have you looked at answers to previously asked similar questions?

Sage 9.0 installation issues on macOS 10.15.2 Catalina https://ask.sagemath.org/question/49572
SageMath 9.0 installation not running on Catalina https://ask.sagemath.org/question/49568
sage-support, 2020-05-04 Apparently Sage lost Python https://groups.google.com/d/topic/sag...
sage-support, 2020-02-07 sage does not run on Mac Catalina https://groups.google.com/d/topic/sag...
sage-support, 2020-01-06 Jupiter Server fails to start on macOS Catalina https://groups.google.com/d/topic/sag...
sage-support, 2020-01-06 Failed Sage 9.0 build on Catalina https://groups.google.com/d/topic/sag...
sage-support, 2019-10-09 SageMath installation in macOS Catalina https://groups.google.com/d/topic/sag...
2019-06-21 macOS Catalina https://groups.google.com/d/topic/sag...

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Thanks a lot for the speedy reply and for the helpful links! I had looked at several before asking this, but missed this one particularly useful link:

https://groups.google.com/forum/#!top...

Following up on that link eventually led me to find that there is a global way to disable Gatekeeper:

sudo spctl --master-disable

admitUser ( 2020-05-06 01:45:22 +0100 )edit

Glad this helped, and thanks for explaining which particular link and command helped.

slelievre ( 2020-05-06 23:13:51 +0100 )edit

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“python3.7” cannot be opened because the developer cannot be verified.