Unexpected error

Question

When launching my program and inputing = suma
while True:
print("Opciones")
print("Ingrese suma para sumar")
print("Ingrese \'resta\' para restar")
print("Ingrese \'division\' para dividir")
print("Ingrese \'multiplicacion\' para multiplicar")
print("Enter \'quit\' to exit.")
user_input = input(":")
if user_input == "suma":
num1 = float(input("Enter a number: "))
num2 = float(input("Enter another number: "))
result = str(num1 + num2)
print("The answer is " + result)
Error is
Opciones
Ingrese suma para sumar
Ingrese 'resta' para restar
Ingrese 'division' para dividir
Ingrese 'multiplicacion' para multiplicar
Enter 'quit' to exit.
:add
Traceback (most recent call last):
File "calculadora.py", line 8, in <module>
user_input = input(":")
File "<string>", line 1, in <module>
NameError: name 'suma' is not defined
Process finished with exit code 1.

Answer 1

First of all, SoloLearn doen't support interactive inputting.
Secondly, apparently you tried to run the program with
= suma
in beginning.
This works:
https://code.sololearn.com/cRlX9yd1u83V/?ref=app
Input in this order:
+
5
3