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

Question

When trying to use any hg Mercurial commands on the console, I keep getting this error. I installed Python using Homebrew and I am running Mac OS Catalina v. 1

Answer 1

I had this issue recently (2020, May) with Google's GCP CLI. It also works on the obsolete Python 2.7.

This is a borked Python 2 installation problem. mBrew no longer correctly installs Python 2 gracefully, as no one cares about abondonware.

Conda still installs Python 2 in an environment; I did that.

Answer 2

When I would import hashlib I would see an error message stating that hash md5 was not found.

I was able to fix this problem by first unlinking openssl: brew unlink openssl

Then I uninstalled python 2.7 using MacPorts: sudo port uninstall python27

Then I installed python 2.7 using MacPorts: sudo port install python27

Now importing hashlib works :)

Answer 3

On macOS Mojave (10.14.6), this worked for me:

• Save the file as python@2.rb in your current directory.
• brew reinstall python@2.rb
• I was using virtual environments, so I had to link them back to /usr/local/bin/python and /usr/local/bin/pip for python and pip binaries.

Answer 4

My problem was having pyenv installed and pointing to an old python 2 version

Uninstall python@2 (python2 was EOL since Jan 1st, 2020)

$ brew uninstall python@2
Uninstalling /usr/local/Cellar/python@2/2.7.15_1... (4,169 files, 76.0MB)

then

$ pyenv versions
  system
* 2.7.12 (set by /Users/admin/.python-version)
  3.4.5
  3.7.7

$ pyenv local system
$ pyenv global system

Answer 5

Managed to fix this by first unlinking openssl

brew unlink openssl

And then reinstalling python

brew reinstall python@2

I also noticed that when running 'brew doctor' there was a warning related to an openssl folder found in /usr/local/include/node/. I deleted this folder before running the above commands (not sure if related)