Coercing one object to type of another

Chris Angelico rosuav at
Sat Feb 9 11:43:28 CET 2013

On Sat, Feb 9, 2013 at 9:29 PM, Vijay Shanker <deontics at> wrote:
> Hi
> Inside a function i get a two arguments, say arg1 and arg2, how can i convert arg2 to same type as arg1 ?
> I dont know type of arg1 or arg2 for that matter, I just want to convert arg2 to type of arg1 if possible and handle the exception if raised.
> Also:
>>>> int('2')
> 2
>>>> float('2.0')
> 2.0
>>>> coerce(2,2.0)
> (2.0,2.0)
> but coerce('2',2) fails.If int('2') equals 2, why should it fail ?

You can get the type of any object, and call that:

def coerce(changeme,tothis):
    return type(tothis)(changeme)


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