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A friend of mine sent me some code including the numpy, functools and matplotlib packages which work fine on his windows system and does not raise any warning/exceptions. The same code does not work on my system, I get many "-inf" or "nan" values my friend does not get.

When I run the same code on my MacBook (OS X 10.14), python 3.6 and the same installed packages I get the following errors:

/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/numpy/linalg/linalg.py:2022: RuntimeWarning: overflow encountered in det
 r = _umath_linalg.det(a, signature=signature)
/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/ipykernel_launcher.py:90: RuntimeWarning: invalid value encountered in multiply
/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/ipykernel_launcher.py:94: RuntimeWarning: invalid value encountered in multiply
/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/numpy/linalg/linalg.py:2022: RuntimeWarning: invalid value encountered in det
 r = _umath_linalg.det(a, signature=signature)
/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/ipykernel_launcher.py:99: RuntimeWarning: invalid value encountered in multiply
/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/ipykernel_launcher.py:76: RuntimeWarning: divide by zero encountered in log`

I also noticed that when I try to "pip install functools" I get some error messages which are not clear to me. Could it be the case that the new Mojave update destroyed something on my system?

/usr/bin/clang -fno-strict-aliasing -Wsign-compare -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -arch i386 -arch x86_64 -g -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c src/functools.c -o build/temp.macosx-10.6-intel-3.6/src/functools.o
 src/functools.c:43:6: warning: implicit declaration of function 'Py_InitModule3' is invalid in C99 [-Wimplicit-function-declaration]
 m = Py_InitModule3("_functools", NULL, functools_doc);
 ^
 src/functools.c:43:6: warning: this function declaration is not a prototype [-Wstrict-prototypes]
 src/functools.c:43:4: warning: incompatible integer to pointer conversion assigning to 'PyObject *' (aka 'struct _object *') from 'int' [-Wint-conversion]
 m = Py_InitModule3("_functools", NULL, functools_doc);
 ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 src/functools.c:45:3: error: non-void function 'init_functools' should return a value [-Wreturn-type]
 return;
 ^
 src/functools.c:49:2: error: non-void function 'init_functools' should return a value [-Wreturn-type]
 return;
 ^
 3 warnings and 2 errors generated.
 error: command '/usr/bin/clang' failed with exit status 1

Command "/Library/Frameworks/Python.framework/Versions/3.6/bin/python3 -u -c "import setuptools, tokenize;__file__='/private/var/folders/hg/qhfjf8mn647dsz9p4c85j0z40000gn/T/pip-install-nek3bgo1/functools/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('rn', 'n');f.close();exec(compile(code, __file__, 'exec'))" install --record /private/var/folders/hg/qhfjf8mn647dsz9p4c85j0z40000gn/T/pip-record-6vakus33/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /private/var/folders/hg/qhfjf8mn647dsz9p4c85j0z40000gn/T/pip-install-nek3bgo1/functools/`

EDIT: Just to make it more clear, it is not only that I get error messages my friend does not get, the code doesn't work at all on my system.

Two things: first, functools is part of the Python standard library. It comes as a part of every Python distribution, so you won't need to install it with pip. I believe the error you're getting is down to the fact that there is still a functools package up on PyPI (the repository where pip fetches packages from). However, it was last updated in 2005. It is not the functools that you want. Don't run pip install functools. You can just do import functools in any of your Python code, and the import should just work.

Second, the fact that you're getting warnings when your friend isn't could be due to a lot of different things. You'll have to debug the code yourself in order to figure out what's going wrong. The easiest way to do this is to change the warnings into errors. Add the following line near the top of the Python script that you're executing (after the import statements):

np.seterr(all='raise')

While that line is in place, whenever numpy would raise a warning it will raise an error instead. The error will include a stacktrace that leads back to the buggy line in your own code. This will help you get started figuring out what's wrong.