On Jan 9, 2011, at 12:32 AM, Carey Gagnon wrote:
> As I'm still learning python, I'm confused by something. I've set up a
> virtual field with the following method:
>
> def getExtrasNumber(self):
> extrasID = self.Record.id
> extrasType = self.Record.type
> extrasCreated = self.Record.datecreated
> extrasYear = extrasCreated.strftime('%y')
> return extrasType, extrasYear, extrasID
> #print extrasType, extrasYear, extrasID
>
>
> with the return statement I get:
> (u'DEX', '11', 4L)
>
> with the print statement I get:
> DEX 11 - 4
>
> I want the return statement to format the output like the print statement
> Can anyone explain?
Jacek gave you the code you need; let me explain the difference.
In the return statement, you are defining a tuple to be returned. One
thing many don't know is that in a tuple, the parentheses are optional! To see
this, open a Python session, and type:
>>> 1,2,3
(1, 2, 3)
Note that even though I typed those numbers without parentheses and
without spaces after the commas, Python interpreted what I entered as the tuple
(1, 2, 3). It is actually the comma that defines a tuple; the parentheses are
for readability and explicitness:
>>> 1
1
>>> 1,
(1,)
'print', on the other hand, is a built-in Python statement that accepts
a comma-separated list of expressions and writes them to stdout. When you
execute the print statement, it is evaluating each expression, converting to a
string, and then writing it to stdout.
-- Ed Leafe
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