Help!!!! Error in Code

[Ravi1001]

Hi,

I am working on a calculator.

I somehow completed it, but i am getting an error.
Unable to figure out.

Help!

Thanks!

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

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

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

# divide
def divide (n1, n2):
    return n1 / n2

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


num1 = int(input("What's the first number?"))
for operation in operations:
    print(operation)
sign = input("What do you want to do?")
num2 = int(input("What's the new number?"))

calculation_function = operations[sign]
Answer = calculation_function (num1, num2)
print (f"{num1}{sign}{num2} = {Answer}")

Error:
  Answer = calculation_function (num1, num2)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: 'str' object is not callable

[error]

[/error]