what is wrong with my user_input line? practice calc

Question

while True:
print ("options:")
print ("Enter 'add' to add two numbers:")
print ("Enter 'sub' to subtract two numbers:")
print ("Enter 'mult' to multiply two numbers:")
print ("Enter 'div' to divide two numbers:")
print ("Enter 'quit' to end program:")
user_input = input(":")

if user_input == "quit":
break

elif user_input == "add":
num1 = (float("Enter a number:"))
num2 = (float("Enter the second number:"))
result = str(num1 + num2)
print ("The answer is" + result)

elif user_input == "sub":
num1 = (float("Enter a number:"))
num2 = (float("Enter the second number:"))
result = str(num1 - num2)
print("The answer is" + result)

elif user_input == "mult":
num1 = (float("Enter a number:"))
num2 = (float("Enter the second number:"))
result = str(num1 * num2)
print("The answer is" + result)

elif user_input == "div":
num1 = (float("Enter a number:"))
num2 = (float("Enter the second number:"))
result = str(num1 / num2)
print("The answer is" + result)

line 8
user_input = input(":") is giving me grief in code playground

Answer 1

There is a more dire problem.
You are trying to convert strings into floats.
乁ʕ •̀ ۝ •́ ʔㄏ
I assume you forgot the input().
This calculator would not work in the code playground. You must run it on the python on your computer or QPython 3 for android.

Answer 2

Thank you. I am investigating the strings into floats issue, but as I'm a brand new baby, I'm not doing well.