#!/usr/bin/env python > 2.4?

[rh0dium]

Hi Folks,

OK I love the logging module. I use it everywhere. I was happily
putting at the top of each of my scripts

------<snip>------
#!/usr/bin/env python2.4

import logging

LOGLEVEL=loggin g.INFO

# Set's up a basic logger
logging.basicCo nfig(level=LOGL EVEL, format="%(ascti me)s %(name)s %
(levelname)-8s %(message)s",
datefmt='%d %b %Y %H:%M:%S', stream=sys.stde rr)

try:
module= os.path.basenam e(traceback.ext ract_stack(limi t=2)[1]
[0]).split(".py")[0]+"."
except:
module = os.path.basenam e(traceback.ext ract_stack(limi t=2)[0]
[0]).split(".py")[0]+"."

def main(loglevel=F alse):
""" """
# Setup Logging
log = logging.getLogg er(module+sys._ getframe().f_co de.co_name )
if loglevel is not False: log.setLevel(lo glevel)
else:log.setLev el(logging.WARN )

log.debug("I LOVE LOGGING")

if __name__ == '__main__':
sys.exit(main(l oglevel=LOGLEVE L))


------<snip>------

But now you guys continued to make this cool language and 2.5 came
out. Great now how do I put /usr/bin/env python>2.4?

Or can you suggest a better way to skin this cat?

Thanks again!!

[Steve Holden]

Re: #!/usr/bin/env python &gt; 2.4?

rh0dium wrote:

Hi Folks,
>
OK I love the logging module. I use it everywhere. I was happily
putting at the top of each of my scripts
>
------<snip>------
#!/usr/bin/env python2.4
>

[...]

>
But now you guys continued to make this cool language and 2.5 came
out. Great now how do I put /usr/bin/env python>2.4?
>
Or can you suggest a better way to skin this cat?
>
Thanks again!!
>

The usual way is something like

#!/usr/bin/env python

Python usually installs so the latest version gets linked as
/usr/bin/python. HTere's no need to bind your scripts to a particular
version.

regards
Steve
--
Steve Holden +44 150 684 7255 +1 800 494 3119
Holden Web LLC/Ltd http://www.holdenweb.com
Skype: holdenweb http://del.icio.us/steve.holden
Recent Ramblings http://holdenweb.blogspot.com

[rh0dium]

Re: #!/usr/bin/env python &gt; 2.4?

Python usually installs so the latest version gets linked as
/usr/bin/python. HTere's no need to bind your scripts to a particular
version.
>
regards

True - but that entirely depends on your path. Example:

Redhat (RHEL3) ships with python2.3 in /usr/bin
Adding an 2.5 version to /usr/local/bin

set PATH=/usr/local/bin:/usr/bin

"python" - will use 2.5

Conversely if you:
set PATH=/usr/bin:/usr/local/bin

"python" - will use 2.3

but if I wanted to ensure I was using 2.5 I would simply type
python2.5 I want to ensure that the python version I am using is at
lease 2.4

[Stargaming]

Re: #!/usr/bin/env python &gt; 2.4?

rh0dium schrieb:

>>Python usually installs so the latest version gets linked as
>>/usr/bin/python. HTere's no need to bind your scripts to a particular
>>version.
>>
>>regards

>
>
True - but that entirely depends on your path. Example:
>
Redhat (RHEL3) ships with python2.3 in /usr/bin
Adding an 2.5 version to /usr/local/bin
>
set PATH=/usr/local/bin:/usr/bin
>
"python" - will use 2.5
>
Conversely if you:
set PATH=/usr/bin:/usr/local/bin
>
"python" - will use 2.3
>
but if I wanted to ensure I was using 2.5 I would simply type
python2.5 I want to ensure that the python version I am using is at
lease 2.4
>
>
>

#!/usr/bin/env python

and

from sys import version_info
if version_info[0] < 2 or version_info[1] < 4:
raise RuntimeError("Y ou need at least python2.4 to run this script")

IMO you shouldn't struggle with it too hard. If the user's python
version is not appropriate, don't hack its interpreter mechanism to do
the work you need. Anyways, you should not check for specific python
versions but for modules/APIs/builtins whatever and *then* you may raise
an exception pointing the user to the fact that is python version does
not fit your needs.

HTH,
Stargaming

[rh0dium]

Re: #!/usr/bin/env python &gt; 2.4?

On Mar 20, 12:30 pm, Stargaming <stargam...@gma il.comwrote:

>
from sys import version_info
if version_info[0] < 2 or version_info[1] < 4:
raise RuntimeError("Y ou need at least python2.4 to run this script")

This is great!!

>
IMO you shouldn't struggle with it too hard. If the user's python
version is not appropriate, don't hack its interpreter mechanism to do
the work you need. Anyways, you should not check for specific python
versions but for modules/APIs/builtins whatever and *then* you may raise
an exception pointing the user to the fact that is python version does
not fit your needs.

I agree but where do you raise the exception? Quite frankly it's
silly to kill the whole app when a bunch of debug lines won't print
and shouldn't except by the developer..
In other words is what you propose the right way to solve this for
modules which were'nt included in older python releases? Or should I
be doing something different and if so what should I do? I like the
solution you give - it will work for everything I do - but is it smart
to retrofit this into all of my old code? What is the clean way to
solve this?

Just want to do this the right way.

[Jon Ribbens]

Re: #!/usr/bin/env python &gt; 2.4?

In article <etpcon$1g8r$1@ ulysses.news.ti scali.de>, Stargaming wrote:

from sys import version_info
if version_info[0] < 2 or version_info[1] < 4:
raise RuntimeError("Y ou need at least python2.4 to run this script")

That'll fail when the major version number is increased (i.e. Python 3.0).

You want:

if sys.hexversion < 0x020400f0:
... error ...

[Sion Arrowsmith]

Re: #!/usr/bin/env python &gt; 2.4?

Jon Ribbens <jon+usenet@une quivocal.co.ukw rote:

>You want:
>
if sys.hexversion < 0x020400f0:
... error ...

"Readabilit y counts."

if sys.version_inf o < (2, 4):
... error ...

--
\S -- siona@chiark.gr eenend.org.uk -- http://www.chaos.org.uk/~sion/
___ | "Frankly I have no feelings towards penguins one way or the other"
\X/ | -- Arthur C. Clarke
her nu becomeþ se bera eadward ofdun hlæddre heafdes bæce bump bump bump

[Jon Ribbens]

Re: #!/usr/bin/env python &gt; 2.4?

In article <4Rf*J7eGr@news .chiark.greenen d.org.uk>, Sion Arrowsmith wrote:

Jon Ribbens <jon+usenet@une quivocal.co.ukw rote:

> if sys.hexversion < 0x020400f0:
> ... error ...

>
"Readabilit y counts."
>
if sys.version_inf o < (2, 4):
... error ...

Maybe you should suggest a patch to the Python documentation then ;-)

The formula I mentioned is the one suggested in the official Python
documentation ( http://docs.python.org/lib/module-sys.html#l2h-5143 )
as being the way to check the Python version.

[starGaming@gmail.com]

Re: #!/usr/bin/env python &gt; 2.4?

On Mar 21, 11:07 am, Jon Ribbens <jon+use...@une quivocal.co.ukw rote:

In article <etpcon$1g8...@ ulysses.news.ti scali.de>, Stargaming wrote:

from sys import version_info
if version_info[0] < 2 or version_info[1] < 4:
raise RuntimeError("Y ou need at least python2.4 to run this script")

>
That'll fail when the major version number is increased (i.e. Python 3.0).
>
You want:
>
if sys.hexversion < 0x020400f0:
... error ...

Yes, it was intended to be and 'and' instead of an 'or'.

[Sander Steffann]

Re: #!/usr/bin/env python &gt; 2.4?

Hi,

Op 21-mrt-2007, om 20:41 heeft starGaming@gmai l.com het volgende
geschreven:

On Mar 21, 11:07 am, Jon Ribbens <jon+use...@une quivocal.co.ukw rote:

>In article <etpcon$1g8...@ ulysses.news.ti scali.de>, Stargaming wrote:

>>from sys import version_info
>>if version_info[0] < 2 or version_info[1] < 4:
>> raise RuntimeError("Y ou need at least python2.4 to run this
>>script")

>>
>That'll fail when the major version number is increased (i.e.
>Python 3.0).
>>
>You want:
>>
> if sys.hexversion < 0x020400f0:
> ... error ...

>
Yes, it was intended to be and 'and' instead of an 'or'.

If you make it an 'and' it will not raise the exception on version
like 1.5 or 2.3... If you realy want to use version_info, you'll have
to do something like:

if version_info[0] < 2 or (version_info[0] == 2 and version_info[1] <
4):
raise RuntimeError

- Sander

[starGaming@gmail.com]

Re: #!/usr/bin/env python &gt; 2.4?

On Mar 21, 11:11 pm, Sander Steffann <s.steff...@com putel.nlwrote:

Hi,
>
Op 21-mrt-2007, om 20:41 heeft starGam...@gmai l.com het volgende
geschreven:
>
>
>

On Mar 21, 11:07 am, Jon Ribbens <jon+use...@une quivocal.co.ukw rote:

In article <etpcon$1g8...@ ulysses.news.ti scali.de>, Stargaming wrote:
>from sys import version_info
>if version_info[0] < 2 or version_info[1] < 4:
> raise RuntimeError("Y ou need at least python2.4 to run this
>script")

>

That'll fail when the major version number is increased (i.e.
Python 3.0).

>

You want:

>

if sys.hexversion < 0x020400f0:
... error ...

>

Yes, it was intended to be and 'and' instead of an 'or'.

>
If you make it an 'and' it will not raise the exception on version
like 1.5 or 2.3... If you realy want to use version_info, you'll have
to do something like:
>
if version_info[0] < 2 or (version_info[0] == 2 and version_info[1] <
4):
raise RuntimeError
>
- Sander

I don't see any problem with::

if version_info[0] <= 2 and version_info[1] < 4:
raise RuntimeError()

Huh?

[Jon Ribbens]

Re: #!/usr/bin/env python &gt; 2.4?

In article <1174580529.081 658.326800@b75g 2000hsg.googleg roups.com>, starGaming@gmai l.com wrote:

I don't see any problem with::
>
if version_info[0] <= 2 and version_info[1] < 4:
raise RuntimeError()

What if the version number is 1.5?

[starGaming@gmail.com]

Re: #!/usr/bin/env python &gt; 2.4?

On Mar 22, 5:23 pm, Jon Ribbens <jon+use...@une quivocal.co.ukw rote:

In article <1174580529.081 658.326...@b75g 2000hsg.googleg roups.com>, starGam...@gmai l.com wrote:

I don't see any problem with::

>

if version_info[0] <= 2 and version_info[1] < 4:
raise RuntimeError()

>
What if the version number is 1.5?

Ah, now I get your problem. OK.

[Gabriel Genellina]

Re: #!/usr/bin/env python &gt; 2.4?

En Wed, 21 Mar 2007 07:07:20 -0300, Jon Ribbens
<jon+usenet@une quivocal.co.uke scribió:

In article <etpcon$1g8r$1@ ulysses.news.ti scali.de>, Stargaming wrote:

>from sys import version_info
>if version_info[0] < 2 or version_info[1] < 4:
> raise RuntimeError("Y ou need at least python2.4 to run this
>script")

>
That'll fail when the major version number is increased (i.e. Python
3.0).
>
You want:
>
if sys.hexversion < 0x020400f0:
... error ...

(what means the final f0?) I find a lot easier to use (and read) this:

if sys.version_inf o < (2,4):
raise RuntimeError("Y ou need at least python2.4...")

(Does the f0 account for the prereleases?)
--
Gabriel Genellina

[Gabriel Genellina]

Re: #!/usr/bin/env python &gt; 2.4?

En Wed, 21 Mar 2007 14:42:53 -0300, Jon Ribbens
<jon+usenet@une quivocal.co.uke scribió:

In article <4Rf*J7eGr@news .chiark.greenen d.org.uk>, Sion Arrowsmith
wrote:

>Jon Ribbens <jon+usenet@une quivocal.co.ukw rote:

>> if sys.hexversion < 0x020400f0:
>> ... error ...

>>
>"Readabilit y counts."
>>
>if sys.version_inf o < (2, 4):
> ... error ...

>
Maybe you should suggest a patch to the Python documentation then ;-)
>
The formula I mentioned is the one suggested in the official Python
documentation ( http://docs.python.org/lib/module-sys.html#l2h-5143 )
as being the way to check the Python version.

Uh... I never thought it was an implied formula there - that F0 had to
come from 1.5 = 15 = 0xF.
I think it should be stated much more clearly.

--
Gabriel Genellina