“ERROR:root:code for hash md5 was not found” when using any hg mercurial commands

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Running brew reinstall python@2 didn’t work for my existing Python 2.7 virtual environments. Inside them there were still ERROR:root:code for hash sha1 was not found errors.

I encountered this problem after I ran brew upgrade openssl. And here’s the fix:

$ ls /usr/local/Cellar/openssl

…which shows

1.0.2t

According to the existing version, run:

$ brew switch openssl 1.0.2t

…which shows

Cleaning /usr/local/Cellar/openssl/1.0.2t
Opt link created for /usr/local/Cellar/openssl/1.0.2t

After that, run the following command in a Python 2.7 virtualenv:

(my-venv) $ python -c "import hashlib;m=hashlib.md5();print(m.hexdigest())"

…which shows

d41d8cd98f00b204e9800998ecf8427e

No more errors.

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