Instead of every time you execute python or ipython, have to write "import os" or other common packages, this script will start python with these packages imported
#!/usr/bin/env bash
# -------------------------------------------------------------
# Calls ipython or python3 with multiple packages imported
# -------------------------------------------------------------
if [[ -z "$1" ]] || [[ -f "$1" ]]; then
[[ -n "$(command -v ipython3)" ]] && EXEC="ipython3" || EXEC=python3
TMP_PY=/$TMPDIR/$EXEC.py
printf "import os, re, sys, math, datetime, yaml\n" >$TMP_PY
$EXEC -i $TMP_PY "$@"
else
python3 "$@"
fi