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question on subprogram parameter

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  question on subprogram parameter skyworld <chenyong20000@gmail.com> - 2012-10-28 20:03 -0700
    Re: question on subprogram parameter MRAB <python@mrabarnett.plus.com> - 2012-10-29 03:35 +0000

#32328 — question on subprogram parameter

Hi,

I'm studying python now and I saw a piece of code like this:

def storeDbase(db, dbfilename=dbfilename):
     .....
     dbfile=open(dbfilename,'w')
     for key in db:
          print(key, file=dbfile)


can anybody help me to understand what does this "file=dbfile" mean
and what is its function? thanks.

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#32330

On 2012-10-29 03:03, skyworld wrote:
> Hi,
>
> I'm studying python now and I saw a piece of code like this:
>
> def storeDbase(db, dbfilename=dbfilename):
>       .....
>       dbfile=open(dbfilename,'w')
>       for key in db:
>            print(key, file=dbfile)
>
>
> can anybody help me to understand what does this "file=dbfile" mean
> and what is its function? thanks.
>
It's a keyword parameter.

Normally 'print' sends its output to the standard output (usually it's
the screen).

Adding 'file=dbfile' tells it to send its output to the file referred
to by 'dbfile' instead.

It's all in the documentation!

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