Error

Command /home/docs/checkouts/readthedocs.org/user_builds/ion-python/envs/latest/bin/python -m pip install --exists-action=w --no-cache-dir -r requirements.txt failed: DEPRECATION: Python 2.7 reached the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 is no longer maintained. pip 21.0 will drop support for Python 2.7 in January 2021. More details about Python 2 support in pip can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support pip 21.0 will remove support for this functionality. Collecting appdirs==1.4.4 Downloading appdirs-1.4.4-py2.py3-none-any.whl (9.6 kB) Collecting attrs==21.2.0 Downloading attrs-21.2.0-py2.py3-none-any.whl (53 kB) Collecting distlib==0.3.2 Downloading distlib-0.3.2-py2.py3-none-any.whl (338 kB) Collecting filelock==3.0.12 Downloading filelock-3.0.12.tar.gz (8.5 kB) Collecting iniconfig==1.1.1 Downloading iniconfig-1.1.1-py2.py3-none-any.whl (5.0 kB) Collecting jsonconversion==0.2.12 Downloading jsonconversion-0.2.12.tar.gz (13 kB) Requirement already satisfied: packaging==20.9 in /home/docs/checkouts/readthedocs.org/user_builds/ion-python/envs/latest/lib/python2.7/site-packages (from -r requirements.txt (line 7)) (20.9) Collecting pluggy==0.13.1 Downloading pluggy-0.13.1-py2.py3-none-any.whl (18 kB) Collecting py==1.10.0 Downloading py-1.10.0-py2.py3-none-any.whl (97 kB) Requirement already satisfied: pyparsing==2.4.7 in /home/docs/checkouts/readthedocs.org/user_builds/ion-python/envs/latest/lib/python2.7/site-packages (from -r requirements.txt (line 10)) (2.4.7) ERROR: Could not find a version that satisfies the requirement pytest==6.2.4 (from -r requirements.txt (line 11)) (from versions: 2.0.0, 2.0.1, 2.0.2, 2.0.3, 2.1.0, 2.1.1, 2.1.2, 2.1.3, 2.2.0, 2.2.1, 2.2.2, 2.2.3, 2.2.4, 2.3.0, 2.3.1, 2.3.2, 2.3.3, 2.3.4, 2.3.5, 2.4.0, 2.4.1, 2.4.2, 2.5.0, 2.5.1, 2.5.2, 2.6.0, 2.6.1, 2.6.2, 2.6.3, 2.6.4, 2.7.0, 2.7.1, 2.7.2, 2.7.3, 2.8.0, 2.8.1, 2.8.2, 2.8.3, 2.8.4, 2.8.5, 2.8.6, 2.8.7, 2.9.0, 2.9.1, 2.9.2, 3.0.0, 3.0.1, 3.0.2, 3.0.3, 3.0.4, 3.0.5, 3.0.6, 3.0.7, 3.1.0, 3.1.1, 3.1.2, 3.1.3, 3.2.0, 3.2.1, 3.2.2, 3.2.3, 3.2.4, 3.2.5, 3.3.0, 3.3.1, 3.3.2, 3.4.0, 3.4.1, 3.4.2, 3.5.0, 3.5.1, 3.6.0, 3.6.1, 3.6.2, 3.6.3, 3.6.4, 3.7.0, 3.7.1, 3.7.2, 3.7.3, 3.7.4, 3.8.0, 3.8.1, 3.8.2, 3.9.1, 3.9.2, 3.9.3, 3.10.0, 3.10.1, 4.0.0, 4.0.1, 4.0.2, 4.1.0, 4.1.1, 4.2.0, 4.2.1, 4.3.0, 4.3.1, 4.4.0, 4.4.1, 4.4.2, 4.5.0, 4.6.0, 4.6.1, 4.6.2, 4.6.3, 4.6.4, 4.6.5, 4.6.6, 4.6.7, 4.6.8, 4.6.9, 4.6.10, 4.6.11) ERROR: No matching distribution found for pytest==6.2.4 (from -r requirements.txt (line 11))