Can't change the path through use_python() or use_condaenv()

Hello. I have been trying hard to change the path of the Python in my Mac since py_available() keeps returning FALSE.

I've tried the methods here and someone recommended me to change through use_python() with miniconda path, but still no use. I have the Python 3.7.1 in miniconda. So I also tried going through use_condaenv() but still remain the same with the py_available() FALSE.

Here's the config return in RStudio:
`> py_config()
python: /usr/bin/python
libpython: /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/config/libpython2.7.dylib
pythonhome: /System/Library/Frameworks/Python.framework/Versions/2.7:/System/Library/Frameworks/Python.framework/Versions/2.7
version: 2.7.10 (default, Oct 6 2017, 22:29:07) [GCC 4.2.1 Compatible Apple LLVM 9.0.0 (clang-900.0.31)]
numpy: /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/numpy
numpy_version: 1.8.0

python versions found:
/usr/bin/python
/Users/inger.noire/miniconda3/bin/python`

Many thanks.

Start by reproducing the macOS configuration with py_config(), use_python(), and use_condaenv(), checking which interpreter is selected and why py_available() remains FALSE. Done means the requested Miniconda Python is selected and py_available() returns TRUE; no file or test is named in the issue.