strange test for None

[karoly.kiripolszky]

in my server i use the following piece of code:

ims = self.headers["if-modified-since"]
if ims != None:
t = int(ims)

and i'm always getting the following error:

t = int(ims)
ValueError: invalid literal for int(): None

i wanna know what the hell is going on... first i tried to test using
is not None, but it makes no difference.

[karoly.kiripolszky]

forgot to mention my interpreter version: 2.4.4

[rzed]

"karoly.kiripolszky" <ka****************@gmail.comwrote in
news:11**********************@m58g2000cwm.googlegr oups.com:

in my server i use the following piece of code:

ims = self.headers["if-modified-since"]
if ims != None:
t = int(ims)

and i'm always getting the following error:

t = int(ims)
ValueError: invalid literal for int(): None

i wanna know what the hell is going on... first i tried to test
using is not None, but it makes no difference.

It appears that ims is the string 'None', so it fails the test, but
is an invalid literal.

--
rzed

[Michael Bentley]

On Feb 3, 2007, at 7:47 AM, karoly.kiripolszky wrote:

in my server i use the following piece of code:

ims = self.headers["if-modified-since"]
if ims != None:
t = int(ims)

and i'm always getting the following error:

t = int(ims)
ValueError: invalid literal for int(): None

i wanna know what the hell is going on... first i tried to test using
is not None, but it makes no difference.

Sounds like ims == 'None'. Try changing:

if ims != None:

to

if ims:

and you might also wrap your call to int(ims) in a try block.

HTH,
Michael

[karoly.kiripolszky]

the tested variable was really a string containing "None" instead of
simply None. this is the first time i ran into this error message
confusion. :)

thanks for the help!

On Feb 3, 6:29 pm, Michael Bentley <[e-mail]:

On Feb 3, 2007, at 7:47 AM, karoly.kiripolszky wrote:

in my server i use the following piece of code:

ims = self.headers["if-modified-since"]
if ims != None:
t = int(ims)

and i'm always getting the following error:

t = int(ims)
ValueError: invalid literal for int(): None

i wanna know what the hell is going on... first i tried to test using
is not None, but it makes no difference.

Sounds like ims == 'None'. Try changing:

if ims != None:

to

if ims:

and you might also wrap your call to int(ims) in a try block.

HTH,
Michael