>>> from bson import _cbson
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: dlopen(bson/_cbson.so, 2): no suitable image found.  Did find:
	file system relative paths not allowed in hardened programs

$ git clone git@github.com:mongodb/mongo-python-driver.git
Cloning into 'mongo-python-driver'...
remote: Enumerating objects: 97, done.
remote: Counting objects: 100% (97/97), done.
remote: Compressing objects: 100% (63/63), done.
remote: Total 30933 (delta 54), reused 57 (delta 34), pack-reused 30836
Receiving objects: 100% (30933/30933), 14.86 MiB | 9.66 MiB/s, done.
Resolving deltas: 100% (23585/23585), done.
$ cd mongo-python-driver
$ /System/Library/Frameworks/Python.framework/Versions/2.7/bin/python setup.py build_ext -i
running build_ext
building 'bson._cbson' extension
creating build
creating build/temp.macosx-10.15-x86_64-2.7
creating build/temp.macosx-10.15-x86_64-2.7/bson
cc -fno-strict-aliasing -fno-common -dynamic -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wstrict-prototypes -Wshorten-64-to-32 -iwithsysroot /usr/local/libressl/include -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch x86_64 -pipe -Ibson -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c bson/_cbsonmodule.c -o build/temp.macosx-10.15-x86_64-2.7/bson/_cbsonmodule.o
cc -fno-strict-aliasing -fno-common -dynamic -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wstrict-prototypes -Wshorten-64-to-32 -iwithsysroot /usr/local/libressl/include -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch x86_64 -pipe -Ibson -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c bson/time64.c -o build/temp.macosx-10.15-x86_64-2.7/bson/time64.o
cc -fno-strict-aliasing -fno-common -dynamic -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wstrict-prototypes -Wshorten-64-to-32 -iwithsysroot /usr/local/libressl/include -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch x86_64 -pipe -Ibson -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c bson/buffer.c -o build/temp.macosx-10.15-x86_64-2.7/bson/buffer.o
cc -fno-strict-aliasing -fno-common -dynamic -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wstrict-prototypes -Wshorten-64-to-32 -iwithsysroot /usr/local/libressl/include -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch x86_64 -pipe -Ibson -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c bson/encoding_helpers.c -o build/temp.macosx-10.15-x86_64-2.7/bson/encoding_helpers.o
cc -bundle -undefined dynamic_lookup -Wl,-F. -L/AppleInternal/BuildRoot/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.Internal.sdk/usr/local/libressl/lib build/temp.macosx-10.15-x86_64-2.7/bson/_cbsonmodule.o build/temp.macosx-10.15-x86_64-2.7/bson/time64.o build/temp.macosx-10.15-x86_64-2.7/bson/buffer.o build/temp.macosx-10.15-x86_64-2.7/bson/encoding_helpers.o -o /Users/shane/mongo-python-driver/bson/_cbson.so
ld: warning: directory not found for option '-L/AppleInternal/BuildRoot/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.Internal.sdk/usr/local/libressl/lib'
building 'pymongo._cmessage' extension
creating build/temp.macosx-10.15-x86_64-2.7/pymongo
cc -fno-strict-aliasing -fno-common -dynamic -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wstrict-prototypes -Wshorten-64-to-32 -iwithsysroot /usr/local/libressl/include -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch x86_64 -pipe -Ibson -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c pymongo/_cmessagemodule.c -o build/temp.macosx-10.15-x86_64-2.7/pymongo/_cmessagemodule.o
cc -fno-strict-aliasing -fno-common -dynamic -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wstrict-prototypes -Wshorten-64-to-32 -iwithsysroot /usr/local/libressl/include -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch x86_64 -pipe -Ibson -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c bson/buffer.c -o build/temp.macosx-10.15-x86_64-2.7/bson/buffer.o
cc -bundle -undefined dynamic_lookup -Wl,-F. -L/AppleInternal/BuildRoot/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.Internal.sdk/usr/local/libressl/lib build/temp.macosx-10.15-x86_64-2.7/pymongo/_cmessagemodule.o build/temp.macosx-10.15-x86_64-2.7/bson/buffer.o -o /Users/shane/mongo-python-driver/pymongo/_cmessage.so
ld: warning: directory not found for option '-L/AppleInternal/BuildRoot/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.Internal.sdk/usr/local/libressl/lib'
$ /System/Library/Frameworks/Python.framework/Versions/2.7/bin/python

WARNING: Python 2.7 is not recommended.
This version is included in macOS for compatibility with legacy software.
Future versions of macOS will not include Python 2.7.
Instead, it is recommended that you transition to using 'python3' from within Terminal.

Python 2.7.16 (default, Feb 29 2020, 01:55:37)
[GCC 4.2.1 Compatible Apple LLVM 11.0.3 (clang-1103.0.29.20) (-macos10.15-objc- on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import bson
>>> bson.has_c()
False
>>> from bson import _cbson
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: dlopen(bson/_cbson.so, 2): no suitable image found.  Did find:
	file system relative paths not allowed in hardened programs
>>> from pymongo import _cmessage
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: dlopen(pymongo/_cmessage.so, 2): no suitable image found.  Did find:
	file system relative paths not allowed in hardened programs

$ /System/Library/Frameworks/Python.framework/Versions/2.7/bin/python -m pip install --user --upgrade ./mongo-python-driver
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. 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
Processing ./mongo-python-driver
Building wheels for collected packages: pymongo
  Building wheel for pymongo (setup.py) ... done
  Created wheel for pymongo: filename=pymongo-3.11.0.dev1-cp27-cp27m-macosx_10_15_x86_64.whl size=364018 sha256=c0279586e1adc1791edc9e1cc96f825da960aa46f6667359c7b56919baba5985
  Stored in directory: /Users/shane/Library/Caches/pip/wheels/48/ab/df/80ccba4a1321c605240b466f9e4d8122e4272b156b470930fa
Successfully built pymongo
Installing collected packages: pymongo
  Attempting uninstall: pymongo
    Found existing installation: pymongo 3.10.1
    Uninstalling pymongo-3.10.1:
      Successfully uninstalled pymongo-3.10.1
Successfully installed pymongo-3.11.0.dev1
$ /System/Library/Frameworks/Python.framework/Versions/2.7/bin/python
WARNING: Python 2.7 is not recommended.
This version is included in macOS for compatibility with legacy software.
Future versions of macOS will not include Python 2.7.
Instead, it is recommended that you transition to using 'python3' from within Terminal.

Python 2.7.16 (default, Feb 29 2020, 01:55:37)
[GCC 4.2.1 Compatible Apple LLVM 11.0.3 (clang-1103.0.29.20) (-macos10.15-objc- on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import bson
>>> bson.has_c()
True
>>> from bson import _cbson
>>>