see which of your modules will shadow standard library modules

stdlib-shadows.sh

#!/usr/bin/env sh

EXCLUDES="htdocs mod py vendor tools client qa test"

stdlib_dir=`python -c 'import os; print os.path.dirname(os.__file__)'`
stdlib=`find $stdlib_dir -maxdepth 1 -name '*.py' -exec basename {} .py \;;\
    find $stdlib_dir -maxdepth 2 -name __init__.py -exec dirname {} \; | xargs -L1 basename`

find `[ -n "$1" ] && echo $1 || echo .` \
    -not \( -false \
    `for name in $EXCLUDES; do
        echo " -o -name $name -type d -prune"
    done` \
    \) \
    \( -false \
    `for name in $stdlib; do
        echo " -o -name $name.py -type f -o -name $name -type d"
    done` \
    \)