How to print lambda result ?

Tino Wildenhain tino at wildenhain.de
Tue Jan 20 13:22:17 CET 2009


Hi,

Barak, Ron wrote:
> Hi,
> 
> Wanting to print the correct plural after numbers, I did the following:
> 
> for num in range(1,4):
>     string_ = "%d event%s" % (num,lambda num: num > 1 and "s" or "")
>     print string_
> 
> However, instead of getting the expected output:
> 
> 1 event
> 2 events
> 3 events
> 
> I get:
> 
> 1 event<function <lambda> at 0x00AFE670>
> 2 event<function <lambda> at 0x00AFE670>
> 3 event<function <lambda> at 0x00AFE6B0>

lambda creates a function so this is the result you
are seeing. You would need to call the function
to get your result.

(num,(lambda n: n >1 and "s" or "")(num))

which is just a quite useless application
of lambda :-)

(num,num >1 and "s" or "")

or even

(num,"s" if num >1 else "")

in python > 2.5

or in python <3.0:

(num,"s"*(num >1))

:-)

HTH
Tino
-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/x-pkcs7-signature
Size: 3241 bytes
Desc: S/MIME Cryptographic Signature
URL: <http://mail.python.org/pipermail/python-list/attachments/20090120/bfd6a35d/attachment.bin>


More information about the Python-list mailing list