The versio of astropy is not a high enough version for the pip checks: details below of the output for pip install trippy on python 2.7
DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won't be maintained after that date. A future version of pip will drop support for Python 2.7. More details about Python 2 support in pip, can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support
Collecting trippy
Using cached https://files.pythonhosted.org/packages/81/76/8248ef8ca795a2ce1827c44463657258e6b016c765d2bec2da64731bc9c3/trippy-1.1.1.tar.gz
Collecting numpy>=1.16.2
Downloading https://files.pythonhosted.org/packages/09/96/84cf406fe7d589f3dba9fc0f737e65985a3526c6d8c783f02d4b5a10825d/numpy-1.16.6-cp27-cp27m-macosx_10_9_x86_64.whl (13.9MB)
|████████████████████████████████| 13.9MB 697kB/s
Collecting scipy
Using cached https://files.pythonhosted.org/packages/a3/cf/36b77de4ccb1b841acd4c3c03abe38843c63c3a657cedee9e8fb19a02dc8/scipy-1.2.2-cp27-cp27m-macosx_10_6_intel.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl
Collecting matplotlib
Using cached https://files.pythonhosted.org/packages/3e/d6/4c949597c4186599cc8be08cd11b1e83fe7966676aeee3868bf3e581d852/matplotlib-2.2.4-cp27-cp27m-macosx_10_6_intel.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl
ERROR: Could not find a version that satisfies the requirement astropy>=3.1 (from trippy) (from versions: 0.1, 0.2, 0.2.1, 0.2.2, 0.2.3, 0.2.4, 0.2.5, 0.3, 0.3.1, 0.3.2, 0.4rc1, 0.4rc2, 0.4, 0.4.1, 0.4.2, 0.4.3, 0.4.4, 0.4.5, 0.4.6, 1.0rc1, 1.0rc2, 1.0, 1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.0.5, 1.0.6, 1.0.7, 1.0.8, 1.0.9, 1.0.10, 1.0.11, 1.0.12, 1.0.13, 1.1b1, 1.1rc1, 1.1rc2, 1.1, 1.1.post1, 1.1.post2, 1.1.1, 1.1.2, 1.2rc1, 1.2, 1.2.1, 1.2.2, 1.3rc1, 1.3, 1.3.1, 1.3.2, 1.3.3, 2.0rc1, 2.0, 2.0.1, 2.0.2, 2.0.3, 2.0.4, 2.0.5, 2.0.6, 2.0.7, 2.0.8, 2.0.9, 2.0.10, 2.0.11, 2.0.12, 2.0.13, 2.0.14, 2.0.15, 2.0.16)
ERROR: No matching distribution found for astropy>=3.1 (from trippy)
The versio of astropy is not a high enough version for the pip checks: details below of the output for pip install trippy on python 2.7
DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won't be maintained after that date. A future version of pip will drop support for Python 2.7. More details about Python 2 support in pip, can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support
Collecting trippy
Using cached https://files.pythonhosted.org/packages/81/76/8248ef8ca795a2ce1827c44463657258e6b016c765d2bec2da64731bc9c3/trippy-1.1.1.tar.gz
Collecting numpy>=1.16.2
Downloading https://files.pythonhosted.org/packages/09/96/84cf406fe7d589f3dba9fc0f737e65985a3526c6d8c783f02d4b5a10825d/numpy-1.16.6-cp27-cp27m-macosx_10_9_x86_64.whl (13.9MB)
|████████████████████████████████| 13.9MB 697kB/s
Collecting scipy
Using cached https://files.pythonhosted.org/packages/a3/cf/36b77de4ccb1b841acd4c3c03abe38843c63c3a657cedee9e8fb19a02dc8/scipy-1.2.2-cp27-cp27m-macosx_10_6_intel.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl
Collecting matplotlib
Using cached https://files.pythonhosted.org/packages/3e/d6/4c949597c4186599cc8be08cd11b1e83fe7966676aeee3868bf3e581d852/matplotlib-2.2.4-cp27-cp27m-macosx_10_6_intel.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl
ERROR: Could not find a version that satisfies the requirement astropy>=3.1 (from trippy) (from versions: 0.1, 0.2, 0.2.1, 0.2.2, 0.2.3, 0.2.4, 0.2.5, 0.3, 0.3.1, 0.3.2, 0.4rc1, 0.4rc2, 0.4, 0.4.1, 0.4.2, 0.4.3, 0.4.4, 0.4.5, 0.4.6, 1.0rc1, 1.0rc2, 1.0, 1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.0.5, 1.0.6, 1.0.7, 1.0.8, 1.0.9, 1.0.10, 1.0.11, 1.0.12, 1.0.13, 1.1b1, 1.1rc1, 1.1rc2, 1.1, 1.1.post1, 1.1.post2, 1.1.1, 1.1.2, 1.2rc1, 1.2, 1.2.1, 1.2.2, 1.3rc1, 1.3, 1.3.1, 1.3.2, 1.3.3, 2.0rc1, 2.0, 2.0.1, 2.0.2, 2.0.3, 2.0.4, 2.0.5, 2.0.6, 2.0.7, 2.0.8, 2.0.9, 2.0.10, 2.0.11, 2.0.12, 2.0.13, 2.0.14, 2.0.15, 2.0.16)
ERROR: No matching distribution found for astropy>=3.1 (from trippy)