[Tutor] Understanding the error "method got multiple values for keyword argument "
steve at pearwood.info
Wed Mar 1 06:29:39 EST 2017
On Wed, Mar 01, 2017 at 01:48:04PM +0530, Pabitra Pati wrote:
> I want to understand the error message I am getting.
> Below is my code piece :-
> def total(name, *args):
> if args:
> print("%s has total money of Rs %d/- " %(name, sum(args)))
> print("%s's piggy bank has no money" %name)
We can simplify the code by just ignoring the body :-)
def total(name, *args):
> I can call this method passing the extra arguments inside *().
> *I know the correct way of passing the arguments.* But, I am passing value
> for 'name' in form of param=value, *intentionally*, so that it throws me
> error. However, I am unable to understand the below error message :-
> TypeError: total() got multiple values for keyword argument 'name'
The rules for how function arguments are assigned to parameters are
The documentation even includes an example similar to yours.
Basically, if I am reading it correctly, Python starts by building a
sequence of empty slots, one for each named parameter:
name = <blank>
plus a slot for any extra arguments. Those slots are filled in using
positional arguments, including starred expressions, *then* keyword
arguments are assigned, so in your example you get the `name` parameter
filled in twice: once as a positional argument, and the second time as
the keyword argument.
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