pip install calcupy

from calcupy import Calculator

calculator = Calculator()
calculator.start()

Calculator(number_variables, function_variables, title, bullet)

GRAVITY = 9.8
SPEED = 20

number_variables = {"g": GRAVITY, "v": SPEED}
calculator = Calculator(number_variables)
calculator.start()

$ g
9.8

$ v
20

$ v + g * 0.01
20.098

def factorial(n):
    if n == 0 or n == 1:
        return 1
    return n * factorial(n - 1)


def y(x1, x2):
    return (x1 + 2) * x2


function_variables = {"y": y, "fac": factorial}
calculator = Calculator(None, function_variables)
calculator.start()

$ fac(4)
24

$ y(2.4, 5.1)
22.44

$ fac(3) + y(2.4, 5.1)
28.44

def foo(x, y):
    return x * y ** 2


title = "MY CALCULATOR"
bullet = "->"
number_variables = {"x": 2, "y": 3}
function_variables = {"foo": foo}
calculator = Calculator(number_variables, function_variables, title, bullet)
calculator.start()

MY CALCULATOR

-> foo(2, 3)
18

-> foo(x, y) * 2
36

-> x / 8 * y
0.75

add identifier expression

$ add x 4

$ add y 3

$ x * y
12

$ add x sqrt(5) * tan(8 * 2) / 5

$ x
0.1344468258787234

remove identifier

$ add x 4.2

$ x
4.2

$ remove x

$ x
Error: 'NoneType' object is not subscriptable