wtf-python: Features, not bugs

absolute-import.sh

# Take any version of Python that can import numpy, and run this in a terminal

D=$(mktemp -d)                      # temporary folder
pushd "$D"                          # move there 
mkdir foo                           # create subfolder
echo 'import numpy' >| foo/a.py     #   script a.py
echo 'x++' >| foo/math.py           #   script math.py (invalid)
python foo/a.py                     # run a.py
popd                                # leave temp folder

# .
# ..
# ... waaaaaat

# What happened?
#
# We basically messed with the import path _inside_ NumPy, 
# by calling a script, in a folder which contains another script,
# which name conflicts with a Python builtin module.
#
# Result: when numpy tries to execute "import math", Python serves
# our local foo/math.py, instead of the standard math module.