string in the "simple calculator" lesson

Question

why do we need the "str" in this code:

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

im confused........

Answer 1

print("The answer is"+result )
in this line "The answer is" is a string
and output is integer
we cannot add String and integer
So we have convert integer output in String to display with String...

Answer 2

so that it doesn't try to use math on a string and error out... notice the plus sign in the print statement!

Answer 3

thx ahri and dinesh! :)