Hi, does anybody know how to determine whether an input string (from raw_input) is a float? I know isdigit() works for int types, but what of float types? Or, is the only solution converting the string to a float(),and then assuming the program will crash for non-float input values?

Question

Hi, does anybody know how to determine whether an input string (from raw_input) is a float?  I know isdigit() works for int types, but what of float types?  Or, is the only solution converting the string to a float(),and then assuming the program will crash for non-float input values?

konradzuse · Answer

depends on the language, but yes you can say Float.ParseFloat(string); in Java....

konradzuse · Answer

http://openstudy.com/study#/updates/50fba568e4b010aceb3312fb Someoen asked this yesterday in C it's Convert.

anonymous · Answer

I should clarify:  This is for Python

rsmith6559 · Answer

You could do something like:

try:
    x = float( raw_input( "> " ) )
except:
    #handle it not being a float

anonymous · Answer

Thanks, this is pretty much what I'm going to do.  I just wasn't sure if there was a built in function like isdigit()

rsmith6559 · Answer

There are always regular expressions. "\d*\.?\d*" off the top of my head.