% sign in python?

[korean_dave]

What does this operator do? Specifically in this context

test.log( "[[Log level %d: %s]]" % ( level, msg ), description )

(Tried googling and searching, but the "%" gets interpreted as an
operation and distorts the search results)

[Robert Bossy]

Re: % sign in python?

korean_dave wrote:

What does this operator do? Specifically in this context
>
test.log( "[[Log level %d: %s]]" % ( level, msg ), description )
>
(Tried googling and searching, but the "%" gets interpreted as an
operation and distorts the search results)
>

It's the string formatting operator:

http://docs.python.org/lib/typesseq-strings.html

Btw, a good place to start searching would be:

http://docs.python.org/lib/lib.html

especially:

http://docs.python.org/lib/genindex.html

Cheers
RB

[Roy H. Han]

Re: % sign in python?

The percent sign is a placeholder.

For example, if
level = 1
msg = 'look'

Then
'[[Log level %d: %s]]' % ( level, msg )
becomes
'[[Log level 1: look]]'

%d means insert an integer
%s means insert a string

You can also use dictionaries.
d = {'string1': 'hey', 'string2': 'you'}
Then
'%(string1)s %(string2)s' % d
becomes 'hey you'


On Thu, Jul 17, 2008 at 10:33 AM, korean_dave <davidreynon@gm ail.comwrote:

What does this operator do? Specifically in this context
>
test.log( "[[Log level %d: %s]]" % ( level, msg ), description )
>
(Tried googling and searching, but the "%" gets interpreted as an
operation and distorts the search results)
--

http://mail.python.org/mailman/listinfo/python-list

>

[Terry Reedy]

Re: % sign in python?



korean_dave wrote:

What does this operator do? Specifically in this context
>
test.log( "[[Log level %d: %s]]" % ( level, msg ), description )
>
(Tried googling and searching, but the "%" gets interpreted as an
operation and distorts the search results)

Having seen a number of comments like this over the years (about the
difficulty of searching for symbol meanings), I just started, last
night, a symbol index listing nearly all Python syntax uses of
non-alpha-or-digit ascii symbols. When I finish and upload it
somewhere, I will post an announcement with the link.

tjr

[Steven Howe]

Re: % sign in python?

Terry Reedy wrote:

>
>
korean_dave wrote:

>What does this operator do? Specifically in this context
>>
>test.log( "[[Log level %d: %s]]" % ( level, msg ), description )
>>
>(Tried googling and searching, but the "%" gets interpreted as an
>operation and distorts the search results)

>
Having seen a number of comments like this over the years (about the
difficulty of searching for symbol meanings), I just started, last
night, a symbol index listing nearly all Python syntax uses of
non-alpha-or-digit ascii symbols. When I finish and upload it
somewhere, I will post an announcement with the link.
>
tjr
>
--

http://mail.python.org/mailman/listinfo/python-list

>

I thought, in this contexted, it was mapping operator.
sph

[Jordan]

Re: % sign in python?

On Jul 17, 3:42 pm, Terry Reedy <tjre...@udel.e duwrote:

korean_dave wrote:

What does this operator do? Specifically in this context

>

test.log( "[[Log level %d: %s]]" % ( level, msg ), description )

>

(Tried googling and searching, but the "%" gets interpreted as an
operation and distorts the search results)

>
Having seen a number of comments like this over the years (about the
difficulty of searching for symbol meanings), I just started, last
night, a symbol index listing nearly all Python syntax uses of
non-alpha-or-digit ascii symbols.  When I finish and upload it
somewhere, I will post an announcement with the link.
>
tjr

That sounds great Terry! I look forward to seeing this.

~Jordan

[Tim Roberts]

Re: % sign in python?

Steven Howe <howe.steven@gm ail.comwrote:

>Terry Reedy wrote:

>>
>korean_dave wrote:

>>What does this operator do? Specifically in this context
>>>
>>test.log( "[[Log level %d: %s]]" % ( level, msg ), description )

>
>I thought, in this contexted, it was mapping operator.

What??

Python does not have a "mapping operator". It has a "map" function, but no
equivalent operator.

% is either the string formatting operator (when the left-hand operand is a
string) or the modulo operator (when the left-hand operand is a number).
--
Tim Roberts, timr@probo.com
Providenza & Boekelheide, Inc.

[Terry Reedy]

Re: % sign in python?



Tim Roberts wrote:

Steven Howe <howe.steven@gm ail.comwrote:
>

>Terry Reedy wrote:

>>korean_dave wrote:
>>>What does this operator do? Specifically in this context
>>>>
>>>test.log( "[[Log level %d: %s]]" % ( level, msg ), description )

>I thought, in this contexted, it was mapping operator.

You miss clipped. I never wrote that. Please be careful, especially
about attributing mis-information.

What??
>
Python does not have a "mapping operator". It has a "map" function, but no
equivalent operator.
>
% is either the string formatting operator (when the left-hand operand is a
string) or the modulo operator (when the left-hand operand is a number).

Which I learned 10 years ago. What I did write was a pre-announcement
of a Python symbol glossary, which I just finished a first draft of.
And now to bed ;-)

[Ken Starks]

Re: % sign in python?

Terry Reedy wrote:

>
>
korean_dave wrote:

>What does this operator do? Specifically in this context
>>
>test.log( "[[Log level %d: %s]]" % ( level, msg ), description )
>>
>(Tried googling and searching, but the "%" gets interpreted as an
>operation and distorts the search results)

>
Having seen a number of comments like this over the years (about the
difficulty of searching for symbol meanings), I just started, last
night, a symbol index listing nearly all Python syntax uses of
non-alpha-or-digit ascii symbols. When I finish and upload it
somewhere, I will post an announcement with the link.
>
tjr
>

This will be excellent, Terry.

For the present case, perhaps we should also point out that in
python 3.0:

" Note

The formatting operations described here are obsolete and may go away in
future versions of Python. Use the new String Formatting in new code."

(Taken from the provisional documentation at:

http://docs.python.org/dev/3.0/library/stdtypes.html#old-string-formatting

)

[Tim Roberts]

Re: % sign in python?

Terry Reedy <tjreedy@udel.e duwrote:

>
>Tim Roberts wrote:

>Steven Howe <howe.steven@gm ail.comwrote:
>>

>>Terry Reedy wrote:
>>>korean_dav e wrote:
>>>>What does this operator do? Specifically in this context
>>>>>
>>>>test.log( "[[Log level %d: %s]]" % ( level, msg ), description )
>>>
>>I thought, in this contexted, it was mapping operator.

>
>You miss clipped. I never wrote that. Please be careful, especially
>about attributing mis-information.

If you count the signs, you'll see that I correctly attributed the
question to korean_dave, and the answer to Steve Howe. Steve's reply
contained your name, but there was no text from you in my post.
--
Tim Roberts, timr@probo.com
Providenza & Boekelheide, Inc.