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Command /home/docs/checkouts/readthedocs.org/user_builds/avtraj/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 Please upgrade your Python as Python 2.7 is no longer maintained.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 numpy Downloading numpy-1.16.6-cp27-cp27mu-manylinux1_x86_64.whl (17.0 MB) Collecting mdtraj Downloading mdtraj-1.9.7.tar.gz (2.1 MB) Installing build dependencies: started Installing build dependencies: finished with status 'done' Getting requirements to build wheel: started Getting requirements to build wheel: finished with status 'done' Preparing wheel metadata: started Preparing wheel metadata: finished with status 'error' ERROR: Command errored out with exit status 1: command: /home/docs/checkouts/readthedocs.org/user_builds/avtraj/envs/latest/bin/python /home/docs/checkouts/readthedocs.org/user_builds/avtraj/envs/latest/lib/python2.7/site-packages/pip/_vendor/pep517/_in_process.py prepare_metadata_for_build_wheel /tmp/tmp2srgM7 cwd: /tmp/pip-install-b7yhWm/mdtraj Complete output (18 lines): Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/7/lto-wrapper OFFLOAD_TARGET_NAMES=nvptx-none OFFLOAD_TARGET_DEFAULT=1 Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu 7.5.0-3ubuntu1~18.04' --with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr --with-gcc-major-version-only --program-suffix=-7 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie --with-system-zlib --with-target-system-zlib --enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu Thread model: posix gcc version 7.5.0 (Ubuntu 7.5.0-3ubuntu1~18.04) ./basesetup.py:431: UserWarning: Unrecognized setuptools command ('dist_info --egg-base /tmp/pip-modern-metadata-BSEPgm'), proceeding with generating Cython sources and expanding templates ' '.join(sys.argv[1:]))) C compiler: Attempting to autodetect OpenMP support... Compiler supports OpenMP Attempting to autodetect SSE3 support... Compiler supports SSE3 Attempting to autodetect SSE4.1 support... Compiler supports SSE4.1 Attempting to autodetect NEON support... Did not detect NEON support mdtrajs setup depends on NumPy. Install it prior invoking setup.py ---------------------------------------- ERROR: Command errored out with exit status 1: /home/docs/checkouts/readthedocs.org/user_builds/avtraj/envs/latest/bin/python /home/docs/checkouts/readthedocs.org/user_builds/avtraj/envs/latest/lib/python2.7/site-packages/pip/_vendor/pep517/_in_process.py prepare_metadata_for_build_wheel /tmp/tmp2srgM7 Check the logs for full command output.