Problem importing Jinja2 in a Windows MSI installation

[mar10]

I have a problem importing 'jinja2' in an MSI installation on Windows.

This may be caused by the fact that the package name is 'Jinja2' with a captial 'J',
while it must be imported as 'jinja2'.

While my package runs well as Python installation, this import:

from jinja2 import Environment, FileSystemLoader

fails, when run as exe:

Traceback (most recent call last):
  File "C:\prj\env\wsgidav_build_3.6\lib\site-packages\cx_Freeze\initscripts\__startup__.py", line 14, in run
    module.run()
  File "C:\prj\env\wsgidav_build_3.6\lib\site-packages\cx_Freeze\initscripts\Console.py", line 26, in run
    exec(code, m.__dict__)
  File "wsgidav/server/server_cli.py", line 53, in <module>
  File "C:\Prj\git\wsgidav\wsgidav\default_conf.py", line 17, in <module>
    from wsgidav.addons.dir_browser import WsgiDavDirBrowser
  File "C:\Prj\git\wsgidav\wsgidav\addons\dir_browser\__init__.py", line 32, in <module>
    from jinja2 import Environment, FileSystemLoader
ModuleNotFoundError: No module named 'jinja2'

Interestingly, this import works (capital 'J') inside the exe:

import Jinja2

though it fails shortly afterwards, because the package itself tries to import sub-modules using the small-caps name:

Traceback (most recent call last):
  File "C:\prj\env\wsgidav_build_3.6\lib\site-packages\cx_Freeze\initscripts\__startup__.py", line 14, in run
    module.run()
  File "C:\prj\env\wsgidav_build_3.6\lib\site-packages\cx_Freeze\initscripts\Console.py", line 26, in run
    exec(code, m.__dict__)
  File "wsgidav/server/server_cli.py", line 53, in <module>
  File "C:\Prj\git\wsgidav\wsgidav\default_conf.py", line 17, in <module>
    from wsgidav.addons.dir_browser import WsgiDavDirBrowser
  File "C:\Prj\git\wsgidav\wsgidav\addons\dir_browser\__init__.py", line 22, in <module>
    import Jinja2
  File "C:\prj\env\wsgidav_build_3.6\lib\site-packages\jinja2\__init__.py", line 33, in <module>
    from jinja2.environment import Environment, Template
ModuleNotFoundError: No module named 'jinja2'

Details

• I use a virtual environment with Python 3.6.5
• There I install cx_Freeze-5.1.1-cp36-cp36m-win32.whl
• also pip install Jinja2, and it gets installed as
  <env>\Lib\site-packages\jinja2\.
• I run python setup.py bdist_msi from this environment.
• The resulting package is stored as <project>\build\exe.win32-3.6\lib\Jinja2
• The import exception can be observed, when running
  <project>\build\exe.win32-3.6\wsgidav.exe

I was able to fix a similar issue with PyYAML (that must be imported as 'yaml')
like so in my setup.py:

install_requires = ["defusedxml", "jsmin", "Jinja2", "PyYAML"]

if use_cx_freeze:
    # cx_Freeze seems to be confused by module name 'PyYAML' which
    # must be imported as 'yaml', so we rename here. However it must
    # be listed as 'PyYAML' in the requirements.txt and be installed!
    install_requires.remove("PyYAML")
    install_requires.append("yaml")

however, this does not work for Jinja, maybe because Windows file names are not
case sensitive:

    install_requires.remove("Jinja2")
    install_requires.append("jinja2")

I would really apreciate any thoughts or hints, that would help to solve or
work-around this problem.

Thank you.

[mar10]

Works for me now with the latest version.