_Calculator.py

def add (n1, n2):
    return n1+n2

def subtract(n1, n2):
    return n1-n2

def multiply(n1, n2):
    return n1*n2

def divide(n1, n2):
    return n1/n2
    
operation={
    "+" : add,
    "-" : subtract,
    "*" : multiply,
    "/" : divide
}


def cal():
    from cal_art import logo
    print(logo)
    num1 = float(input("Enter the first number:"))


    should_continue=True
    while should_continue:
        for symbol in operation:
            print(symbol)
        operation_function = input("Select the operation:")
        num2 = float(input("Enter the next number:"))
        c = operation[operation_function]
        ans = c(num1, num2)
        print(f"{num1}{operation_function}{num2} = {ans}")
        if input(f"Type 'y' to continue calculating with {ans}, or type 'n' to start a new calculation: ")=='y':
            num1=ans
        else:
            should_continue = False
            cal()
cal()