It hangs on Python 3.7.4

[gabrieluribegit]

Using Homebrew, unfortunately updated from python 3.7.3 to 3.7.4 and broke my virtualenv. But convert-outlook-msg-file doesn't work even creating new virtualenv

Error after killing it:

  File "qt1.py", line 107, in convert_msg
    f.write(msg.as_bytes())
  File "/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/email/message.py", line 178, in as_bytes
    g.flatten(self, unixfrom=unixfrom)
  File "/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/email/generator.py", line 116, in flatten
    self._write(msg)
  File "/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/email/generator.py", line 195, in _write
    self._write_headers(msg)
  File "/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/email/generator.py", line 418, in _write_headers
    self._fp.write(self.policy.fold_binary(h, v))
  File "/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/email/policy.py", line 200, in fold_binary
    folded = self._fold(name, value, refold_binary=self.cte_type=='7bit')
  File "/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/email/policy.py", line 206, in _fold
    return value.fold(policy=self)
  File "/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/email/headerregistry.py", line 258, in fold
    return header.fold(policy=policy)
  File "/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/email/_header_value_parser.py", line 157, in fold
    return _refold_parse_tree(self, policy=policy)
  File "/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/email/_header_value_parser.py", line 2672, in _refold_parse_tree
    part.ew_combine_allowed, charset)
  File "/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/email/_header_value_parser.py", line 2724, in _fold_as_ew
    get_unstructured(lines[-1][last_ew:] + to_encode))
  File "/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/email/_header_value_parser.py", line 1127, in get_unstructured
    _validate_xtext(vtext)
  File "/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/email/_header_value_parser.py", line 979, in _validate_xtext
    if utils._has_surrogates(xtext):
  File "/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/email/utils.py", line 51, in _has_surrogates
    def _has_surrogates(s):
KeyboardInterrupt
Abort trap: 6

Troubleshooting:

Created a couple of virtualenv, installed compoundfiles, same issue.
Homebrew uninstalled python, and reinstalled, created new virtualenv, same issue.

Solution:

Uninstalled 3.7.4 and rolled back to python 3.7.3:
brew install https://raw.githubusercontent.com/Homebrew/homebrew-core/c24d6bcd4795e9263617e49f340cc61498eea5d3/Formula/python.rb