Cannot install plotnine

I'm trying to install plotnine and I get the following error:

` ERROR: Complete output from command /var/mobile/Containers/Data/Application/415FE8A3-9150-4DC4-BB74-03B29A13F6B5/Library/bin/python3 /var/mobile/Containers/Data/Application/415FE8A3-9150-4DC4-BB74-03B29A13F6B5/Library/lib/python3.7/site-packages/pip/_vendor/pep517/_in_process.py get_requires_for_build_wheel /private/var/mobile/Containers/Data/Application/415FE8A3-9150-4DC4-BB74-03B29A13F6B5/tmp/tmppem74svk:
ERROR: Traceback (most recent call last):
File "/var/mobile/Containers/Data/Application/415FE8A3-9150-4DC4-BB74-03B29A13F6B5/Library/lib/python3.7/site-packages/pip/_vendor/pep517/_in_process.py", line 207, in
main()
File "/var/mobile/Containers/Data/Application/415FE8A3-9150-4DC4-BB74-03B29A13F6B5/Library/lib/python3.7/site-packages/pip/_vendor/pep517/_in_process.py", line 197, in main
json_out['return_val'] = hook(**hook_input['kwargs'])
File "/var/mobile/Containers/Data/Application/415FE8A3-9150-4DC4-BB74-03B29A13F6B5/Library/lib/python3.7/site-packages/pip/_vendor/pep517/_in_process.py", line 48, in get_requires_for_build_wheel
backend = _build_backend()
File "/var/mobile/Containers/Data/Application/415FE8A3-9150-4DC4-BB74-03B29A13F6B5/Library/lib/python3.7/site-packages/pip/_vendor/pep517/_in_process.py", line 31, in _build_backend
ep = os.environ['PEP517_BUILD_BACKEND']
File "/var/mobile/Containers/Data/Application/415FE8A3-9150-4DC4-BB74-03B29A13F6B5/Library/lib/python3.7/os.py", line 680, in __getitem__
raise KeyError(key) from None
KeyError: 'PEP517_BUILD_BACKEND'
----------------------------------------
ERROR: Command "/var/mobile/Containers/Data/Application/415FE8A3-9150-4DC4-BB74-03B29A13F6B5/Library/bin/python3 /var/mobile/Containers/Data/Application/415FE8A3-9150-4DC4-BB74-03B29A13F6B5/Library/lib/python3.7/site-packages/pip/_vendor/pep517/_in_process.py get_requires_for_build_wheel /private/var/mobile/Containers/Data/Application/415FE8A3-9150-4DC4-BB74-03B29A13F6B5/tmp/tmppem74svk" failed with error code 1 in /private/var/mobile/Containers/Data/Application/415FE8A3-9150-4DC4-BB74-03B29A13F6B5/tmp/pip-install-ia1ybp23/statsmodels `

No repository file or test is identified. Start by reproducing the plotnine installation in Carnets and inspect the pip PEP 517 failure while building statsmodels; determine whether the issue is specific to the bundled Python environment or dependency packaging. Done means plotnine installs successfully in the reported Carnets environment.

Written by the indexing model from the issue text.