365 DAYS OF CODE - DAY 13

What is wrong with this code??

Can you tell what it does??

import art

n1 = 0
n2 = 0
selected_operation = ""
solution = 0

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

operations = {
    "+": add,
    "-": subtract,
    "*": multiply,
    "/": divide
}

def rest_of_calculation():
    print("+\n-\n*\n/")
    selected_operation = input("Pick an operation: ")
    n2 = float(input("What is the next number?: "))

    for key in operations:
        if key == selected_operation:
            solution = operations[key](n1, n2)
            print(f"{n1} {key} {n2} = {solution}")

print(art.logo)

n1 = float(input("What is the first number?: "))
rest_of_calculation()

while True:
    new_calculation = input(f"Type 'y' to continue calculating with {solution}, or type 'n' to start a new calculation: ")

    if new_calculation == "y":
        n1 = solution
    else:
        n1 = float(input("What is the first number?: "))

    rest_of_calculation()