Using Python 3 as a screen-logging command-line calculator

cpy

#!/usr/bin/env python3

# Save this in your ~/bin as `cpy` and chmod +x

import code
import readline
import rlcompleter

# Directly import all the math functions
from math import *

print("Interactive Python 3 with 'from math import *'")

vars = globals()
vars.update(locals())
readline.set_completer(rlcompleter.Completer(vars).complete)
readline.parse_and_bind("tab: complete")
shell = code.InteractiveConsole(vars)
shell.interact()

List of functions available in math: https://docs.python.org/3/library/math.html