When executing the command, "pip install -r requirements-dev.txt" I get the error below. My environment Ubuntu 20.04, python 3.7.

Building wheels for collected packages: pytype, importlab
Building wheel for pytype (setup.py) ... error
ERROR: Command errored out with exit status 1:
command: /usr/bin/python3.7 -u -c "import sys, setuptools, tokenize; sys.argv[0] = """""/tmp/pip-install-c1j6y1u8/pytype/setup.py"""""; file="""""/tmp/pip-install-c1j6y1u8/pytype/setup.py""""";f=getattr(tokenize, """""open""""", open)(file);code=f.read().replace("""""\r\n""""", """""\n""""");f.close();exec(compile(code, file, """""exec"""""))" bdist_wheel -d /tmp/pip-wheel-yk48x1gy
cwd: /tmp/pip-install-c1j6y1u8/pytype/
Complete output (1434 lines):
/usr/lib/python3/dist-packages/setuptools/dist.py:476: UserWarning: Normalizing "2019.07.11" to "2019.7.11"
normalized_version,