LXML package states, that has minimal requirements on python - Requires: Python 
>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, != 3.4.*

        
Based on what I see on Travis, it seems to me, that for python 3.9.x. the 
minimum stable LXML version is 4.3.x; is that expected?

Sample log:

Collecting lxml==4.2.6
  Downloading lxml-4.2.6.tar.gz (2.4 MB)
Building wheels for collected packages: lxml
  Building wheel for lxml (setup.py) ... error
  ERROR: Command errored out with exit status 1:
   command: /home/travis/virtualenv/python3.9.1/bin/python -u -c 'import sys, 
setuptools, tokenize; sys.argv[0] = 
'"'"'/tmp/pip-install-i7un6wlk/lxml_b3782dbd0b1b4611a75033d4ab809f51/setup.py'"'"';
 
__file__='"'"'/tmp/pip-install-i7un6wlk/lxml_b3782dbd0b1b4611a75033d4ab809f51/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-v441aa6c
…
…
  creating build/temp.linux-x86_64-3.9/src/lxml
  gcc -pthread -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall 
-g -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security 
-fPIC -DCYTHON_CLINE_IN_TRACEBACK=0 -I/usr/include/libxml2 -Isrc 
-Isrc/lxml/includes -I/home/travis/virtualenv/python3.9.1/include 
-I/opt/python/3.9.1/include/python3.9 -c src/lxml/etree.c -o 
build/temp.linux-x86_64-3.9/src/lxml/etree.o -w
  src/lxml/etree.c: In function ‘__Pyx_modinit_type_init_code’:
  src/lxml/etree.c:230310:32: error: ‘PyTypeObject {aka struct _typeobject}’ 
has no member named ‘tp_print’
     __pyx_type_4lxml_5etree_Error.tp_print = 0;


You can see the full logs and which version was installed sucessfully and which 
not on the compatibility build matrix here:

https://app.travis-ci.com/github/SAP/python-pyodata/builds/233333488
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