Startup errors with Python3

[synergiator]

Hi,

following the README I can't get the tool running with Python 3 for a Python generation.

Example Dockerfile:

FROM python:3.6

RUN pip3 install lstgen &&\
    lstgen 2014 python --class-name Lohnsteuer2014 --outfile lst2014.py

Error:

usage: lstgen [-h] [-l LANG] [-p PAP] [-x XML_PATH] [--pap-versions]
              [--outfile OUTFILE] [--class-name CLASS_NAME] [--indent INDENT]
              [--java-package-name JAVA_PACKAGE] [--php-ns PHP_NAMESPACE]
lstgen: error: unrecognized arguments: 2014 python

Following the help, I have also tried:

FROM python:3.6

RUN pip3 install lstgen &&\
    lstgen -p 2017 -l python

but then get the following error:

/usr/local/lib/python3.6/site-packages/urllib3/connectionpool.py:847: InsecureRequestWarning: Unverified HTTPS request is being made. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
  InsecureRequestWarning)
Traceback (most recent call last):
  File "/usr/local/bin/lstgen", line 11, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.6/site-packages/lstgen/cli.py", line 113, in main
    pap_parser = PapParser(etree.fromstring(xml_content))
  File "/usr/local/lib/python3.6/site-packages/lstgen/__init__.py", line 253, in __init__
    self.parse()
  File "/usr/local/lib/python3.6/site-packages/lstgen/__init__.py", line 259, in parse
    main_element = self.tree_root.xpath('/PAP/METHODS/MAIN')[0]
IndexError: list index out of range