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read the docs (docs/readthedocs.org:ceph) build has been failing with following error -

Downloading funcparserlib-0.3.6.tar.gz (30 kB)
    ERROR: Command errored out with exit status 1:
     command: /home/docs/checkouts/readthedocs.org/user_builds/ceph/envs/43078/bin/python c 'import io, os, sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-cvz336ra/funcparserlib_82933aa642df4cccb61f62ab8aad29ef/setup.py'"'"'; file='"'"'/tmp/pip-install-cvz336ra/funcparserlib_82933aa642df4cccb61f62ab8aad29ef/setup.py'"'"';f = getattr(tokenize, '"'"'open'"'"', open)(file) if os.path.exists(file) else io.StringIO('"'"'from setuptools import setup; setup()'"'"');code = f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, file, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-d1stbazf
         cwd: /tmp/pip-install-cvz336ra/funcparserlib_82933aa642df4cccb61f62ab8aad29ef/
    Complete output (1 lines):
    error in funcparserlib setup command: use_2to3 is invalid.
    ---------------------------------------
WARNING: Discarding https://files.pythonhosted.org/packages/cb/f7/b4a59c3ccf67c0082546eaeb454da1a6610e924d2e7a2a21f337ecae7b40/funcparserlib-0.3.6.tar.gz#sha256=b7992eac1a3eb97b3d91faa342bfda0729e990bd8a43774c1592c091e563c91d (from https://pypi.org/simple/funcparserlib/). Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.