Re: [Tutor] Accessing callers context from callee method
i found the solution
This is my first attempt at memcaching html page using cheetah
since cheetah render needs locals() i use getCallerInfo() to get the
locals() and send to memcached
let me know if it is possible to better do this
*notice getCallerInfo
*
*utils.py*
@log_time_func
def renderpage(key, htmlfile, deleteafter=3600):
from globaldb import mc
try:page = mc.get(key)
except:
page=None
clogger.info('except error mc.get '+ key)
if not page:
clogger.info(key+ ' rendering cheetah page')
terms = getCallerInfo(1)
#print terms
page = str(web.render(htmlfile, asTemplate=True, terms=terms))
try:mc.set(key, page, deleteafter)
except:
clogger.info('except error mc.set '+ key)
return page
@log_time_func
@memcachethis
def mcrenderpage(key, htmlfile, deleteafter=3600):
terms = getCallerInfo(2)
#print terms
return str(web.render(htmlfile, asTemplate=True, terms=terms))
def getCallerInfo(decorators=0):
'''returns locals of caller using frame.optional pass number of
decorators\nFrom Dig deep into python internals
http://www.devx.com/opensource/Article/31593/1954'
''
f = sys._getframe(2+decorators)
args = inspect.getargvalues(f)
return args[3]
*Usage*
key=facebookstuff.APP_NAME+'newstart'+str(uid)
return utils.renderpage(key, 'pick.html')
--
Bidegg worlds best auction site
http://bidegg.com
___
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Re: [Tutor] Accessing callers context from callee method
i found the solution
This is my first attempt at memcaching html page using cheetah
since cheetah render needs locals() i use getCallerInfo() to get the
locals() and send to memcached
let me know if it is possible to better do this
*notice getCallerInfo
*
*utils.py*
@log_time_func
def renderpage(key, htmlfile, deleteafter=3600):
from globaldb import mc
try:page = mc.get(key)
except:
page=None
clogger.info('except error mc.get '+ key)
if not page:
clogger.info(key+ ' rendering cheetah page')
terms = getCallerInfo(1)
#print terms
page = str(web.render(htmlfile, asTemplate=True, terms=terms))
try:mc.set(key, page, deleteafter)
except:
clogger.info('except error mc.set '+ key)
return page
@log_time_func
@memcachethis
def mcrenderpage(key, htmlfile, deleteafter=3600):
terms = getCallerInfo(2)
#print terms
return str(web.render(htmlfile, asTemplate=True, terms=terms))
def getCallerInfo(decorators=0):
'''returns locals of caller using frame.optional pass number of
decorators\nFrom Dig deep into python internals
http://www.devx.com/opensource/Article/31593/1954'
''
f = sys._getframe(2+decorators)
args = inspect.getargvalues(f)
return args[3]
*Usage*
key=facebookstuff.APP_NAME+'newstart'+str(uid)
return utils.renderpage(key, 'pick.html')
--
Bidegg worlds best auction site
http://bidegg.com
On Tue, Feb 24, 2009 at 11:21 PM, A.T.Hofkamp wrote:
> mobiledream...@gmail.com wrote:
>
>> when i call a method foo from another method func. can i access func
>> context
>> variables or locals() from foo
>> so
>> def func():
>> i=10
>> foo()
>>
>> in foo, can i access func's local variables on in this case i
>>
>
> As others have already pointed out, this is a really bad idea.
> Instead you can do:
>
>
> def func():
> i = 10
> i = foo(i)
>
> def foo(i):
> i = i + 1
> return i
>
> Sincerely,
> Albert
>
>
> ___
> Tutor maillist - Tutor@python.org
> http://mail.python.org/mailman/listinfo/tutor
>
___
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Re: [Tutor] Accessing callers context from callee method
mobiledream...@gmail.com wrote: when i call a method foo from another method func. can i access func context variables or locals() from foo so def func(): i=10 foo() in foo, can i access func's local variables on in this case i As others have already pointed out, this is a really bad idea. Instead you can do: def func(): i = 10 i = foo(i) def foo(i): i = i + 1 return i Sincerely, Albert ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Accessing callers context from callee method
wrote when i call a method foo from another method func. can i access func context variables or locals() from foo Yes and there are several ways to do it, but nearly always this is a bad idea. It will make foo almost totally unusable in any other context since it will rely on the calling function having local variables of a specific name (and possibly type). It is usually much better to pass the variables into foo at call time. Or even to use global variables! def func(): i=10 foo() How would you write foo? Would you require the variable in func() to be called i? Or would you assign a referece to it using a dictionary to access it? Can you explain what you really want to do with this? What is the motivation behind the request? There is probably a better alternative... -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Accessing callers context from callee method
> when i call a method foo from another method func. can i access func context
> variables or locals() from foo
> so
> def func():
> i=10
> foo()
>
> in foo, can i access func's local variables
A. python has statically-nested scoping, so you can do it as long as you:
1. define foo() as an inner function -- its def is contained within
func()'s def:
def func():
i = 10
def foo():
print i
2. you don't define a variable with the same name locally. in other
words, you do have access to func()'s 'i' as long as you don't create
another 'i' within foo() -- if you do, only your new local 'i' will be
within your scope.
B. another alterative is to pass in all of func()'s local variables to foo():
foo(**locals())
this will require you to accept the incoming dictionary in foo() and
access the variables from it instead of having them be in foo()'s
scope.
C. in a related note, your question is similar to that of global vs.
local variables. inside a function, you have access to the global as
long as you don't define a local using the same name. should you only
wish to manipulate the global one, i.e. assign a new value to it
instead of creating a new local variable with that name, you would
need to use the "global" keyword to specify that you only desire to
use and update the global one.
i = 0
def func():
i = 10
in this example, the local 'i' in func() hides access to the global
'i'. in the next code snippet, you state you only want to
access/update the global 'i'... IOW, don't create a local one:
i = 0
def func():
global i
i = 10
D. this doesn't work well for inner functions yet:
i = 0
def func():
i = 10
def foo():
i = 20
the 'i' in foo() shadows/hides access to func()'s 'i' as well as the
global 'i'. if you issue the 'global' keyword, that only gives you
access to the global one:
i = 0
def func():
i = 10
def foo():
global i
i = 20
you cannot get access to func()'s 'i' in this case.
E. however, starting in Python 3.x, you'll be able to do somewhat
better with the new 'nonlocal' keyword:
i = 0
print('globally, i ==', i)
def func():
i = 10
print('in func(), i ==', i)
def foo():
nonlocal i
i = 20
print('in foo(), i ==', i)
foo()
print('in func() after calling foo(), i ==', i)
func()
in this case, foo() modified func()'s 'i'.
hope this helps!
-- wesley
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
"Core Python Programming", Prentice Hall, (c)2007,2001
"Python Fundamentals", Prentice Hall, (c)2009
http://corepython.com
wesley.j.chun :: wescpy-at-gmail.com
python training and technical consulting
cyberweb.consulting : silicon valley, ca
http://cyberwebconsulting.com
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Re: [Tutor] Accessing callers context from callee method
On Tue, Feb 24, 2009 at 10:53 AM, wrote: > when i call a method foo from another method func. can i access func context > variables or locals() from foo > so > def func(): > i=10 > foo() > > in foo, can i access func's local variables on in this case i You can, but it's an evil hack that I would avoid if at all possible; there are almost certainly better ways to accomplish whatever your goal is. Cheers, Chris -- Follow the path of the Iguana... http://rebertia.com ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Accessing callers context from callee method
Le Tue, 24 Feb 2009 10:53:29 -0800, mobiledream...@gmail.com s'exprima ainsi: > when i call a method foo from another method func. can i access func context > variables or locals() from foo > so > def func(): > i=10 > foo() > > in foo, can i access func's local variables on in this case i > Thanks a lot def func(): i=10 foo(i) -- la vita e estrany ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Accessing callers context from callee method
when i call a method foo from another method func. can i access func context variables or locals() from foo so def func(): i=10 foo() in foo, can i access func's local variables on in this case i Thanks a lot -- Bidegg worlds best auction site http://bidegg.com ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
