~# python3 -m pip install lxml
Collecting lxml
  Using cached https://files.pythonhosted.org/packages/ea/e2/3834472e7f18801e67a3cd6f3c203a5456d6f7f903cfb9a990e62098a2f3/lxml-5.2.1.tar.gz
Exception:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/pip/_internal/cli/base_command.py", line 143, in main
    status = self.run(options, args)
  File "/usr/lib/python3/dist-packages/pip/_internal/commands/install.py", line 338, in run
    resolver.resolve(requirement_set)
  File "/usr/lib/python3/dist-packages/pip/_internal/resolve.py", line 102, in resolve
    self._resolve_one(requirement_set, req)
  File "/usr/lib/python3/dist-packages/pip/_internal/resolve.py", line 256, in _resolve_one
    abstract_dist = self._get_abstract_dist_for(req_to_install)
  File "/usr/lib/python3/dist-packages/pip/_internal/resolve.py", line 209, in _get_abstract_dist_for
    self.require_hashes
  File "/usr/lib/python3/dist-packages/pip/_internal/operations/prepare.py", line 298, in prepare_linked_requirement
    abstract_dist.prep_for_dist(finder, self.build_isolation)
  File "/usr/lib/python3/dist-packages/pip/_internal/operations/prepare.py", line 100, in prep_for_dist
    self.req.load_pyproject_toml()
  File "/usr/lib/python3/dist-packages/pip/_internal/req/req_install.py", line 428, in load_pyproject_toml
    str(self)
  File "/usr/lib/python3/dist-packages/pip/_internal/pyproject.py", line 43, in load_pyproject_toml
    pp_toml = pytoml.load(f)
  File "/usr/share/python-wheels/pytoml-0.1.2-py2.py3-none-any.whl/pytoml/parser.py", line 303, in load
    filename=fin.name)
  File "/usr/share/python-wheels/pytoml-0.1.2-py2.py3-none-any.whl/pytoml/parser.py", line 370, in loads
    toks.expect('=', 'expected_equals')
  File "/usr/share/python-wheels/pytoml-0.1.2-py2.py3-none-any.whl/pytoml/parser.py", line 250, in expect
    self.error(error_text)
  File "/usr/share/python-wheels/pytoml-0.1.2-py2.py3-none-any.whl/pytoml/parser.py", line 253, in error
    raise TomlError(message, self.pos[0][0], self.pos[0][1], self._filename)
pytoml.core.TomlError: /tmp/pip-install-fo9ik1sz/lxml/pyproject.toml(40, 8): expected_equals

Install from repositories

apt-get install python3-lxml

• Debian 10 Buster