I want to use scripts I wrote earlier in a new virtualenv. In one of the scripts I import

import xml.etree.ElementTree as ET

So I need to import this xml module. I think this was this py-xml module I installed eartlier, but when I try to pip install it in the venv, I get this error:

(venv) user:~/catkin_ws$ pip install py-xml

Collecting py-xml

Using cached https://files.pythonhosted.org/packages/90/02/4a3cf06d254c70334ebf028e0bcd595c6f265ce1f1ed752bf2957dd8ba08/py-xml-1.0.tar.gz

Complete output from command python setup.py egg_info:

Traceback (most recent call last):

File "<string>", line 1, in <module>

File "/tmp/pip-install-XHVo1p/py-xml/setup.py", line 9, in <module>

with open('README.md', 'r', 'utf-8') as fp:

TypeError: an integer is required

----------------------------------------

Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-install-XHVo1p/py-xml/

And I have updated the setuptools and tried it with venv with python3 and python2. Both have the same result. How can I fix this?