[Tutor] Verification of variable input

[Andrei Kulakov]

On Fri, Sep 28, 2001 at 05:43:51PM -0500, runsun wrote:
> Hi all,
> 
> How do I make sure the values been passed into a variable is valid?
> For example:
> 
> [1] a variable "isBoldface" will take:
>      "true", "True", "1", "5" ===> valid
>      "false", "fALSE", "0", anyother type ===> invalid

I guess you'll just have to test for it:

if isBoldFace not in ("true", "True", "1", "5"):
    print "Error!"

> 
> [2] a variable "borderWidth" will take:
>      "2", "2.5", 3 ====> valid
>      "a", any other type =====> invalid
> 
> [3] a variable "align" will take
>      "center", "CENTER", "Center", "Left", "right" ... ==> valid
>      any other values ===> invalid
> 
> I have written two functions for [1] and [2] and both work fine.
> Just thinking if there's any builtin function that I can use.
> 
> For [1]:
> 
> def returnBoolean(b):
>         ''' Reutrn 1 if b = "True", "tRue", "TRUE", "1", and any integer
> other than 0 .....
>             Return 0 if b= 0, 0.00, 5.5, "false", "False", "FALSE", integer
> 0 ....
>         '''
>        if type(b)==type(1):            # If b is an integer
>                 if b!=0: return 1       # anythong other than 0 will set b
> to true
>         elif type(b)==type("a"):        # if b is a string
>                 if b.strip().upper()=="TRUE":   return 1
>                 else return 0
> 
> For [2]
> 
> def returnInt(x):
>         try:
>             x=int(x)            #"3", "-4", 3.5, -1 ...
>             return x
>         except:
>             try:
>                 x=float(x)      #for cases like "3.5"
>                 return int(x)
>             except:
>                 return 0        # "a", or any other data type
> 
> ======================================
>       ~~ Be like water, be shapeless ~~
> Runsun Pan, PhD, Biological Sci. Purdue Univ
> Email: runsun@bilbo.bio.purdue.edu
> Url : http://bilbo.bio.purdue.edu/~runsun
> Tel : 765-496-4186(H), 765-494-4947 (O)
> Fax : 775-665-1494 (USA) 094-656-8001 (Taiwan)
>         (I can access both through my email)
> ======================================
> 
> 
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