Confusing python - Cannot convert string to float

Question

I got a value error and even if I try playing around with the code, it doesn\'t work!

How can I get it right? - I am using Python 3.3.2!

Here is the code:

Answer 1

You need to take into account that the user might not fill in a proper value:

try:
    miles = float(input("How many miles can you walk? "))
except ValueError:
    print("That is not a valid number of miles")

A try/except handles the ValueError that might occur when float tries to convert the input to a float.