On Tuesday, December 29, 2015 at 5:15:24 PM UTC, Mark Lawrence wrote:
> On 29/12/2015 15:20, xeon Mailinglist wrote:
> > On Tuesday, December 29, 2015 at 11:16:10 AM UTC, xeon Mailinglist wrote:
> >> 1. How do I create a global variable that can be accessed by all classes?
> >>
> >> 2. I am using `dogpile.cache` to store data in the cache [1], but if I set
> >> and get the same key from different modules, I don't get the value. Here
> >> is an example in [2]. The value than I get is `NO_VALUE.NO_VALUE`. Why
> >> this happens?
> >>
> >> setter is the setter.py
> >> getter is the getter.py
> >> Memoize is the file in [1].
> >>
> >>
> >> [1] my dogpile class `Memoize.py`
> >>
> >> from dogpile.cache import make_region
> >>
> >> region = make_region().configure('dogpile.cache.memory')
> >>
> >> def save(key, value):
> >> """
> >> general purpose method to save data (value) in the cache
> >>
> >> :param key (string) key of the value to be saved in cache
> >> :param value (any type) the value to be saved
> >> """
> >> region.set(key, value)
> >>
> >>
> >> def get(key):
> >> """
> >> general purpose method to get data from the cache
> >>
> >> :param key (string) key of the data to be fetched
> >> :return value (any type) data to be returned from the cache
> >> """
> >> return region.get(key)
> >>
> >>
> >> [2] My python example
> >>
> >> `setter.py`
> >>
> >> def myset(value):
> >> Memoize.save("myvalue", value)
> >>
> >> `getter.py`
> >>
> >> def myget():
> >> return Memoize.get("myvalue") <- this value is NO_VALUE. NO_VALUE
> >>
> >> My class:
> >>
> >> setter.myset(123)
> >> getter.myget()
> >
> > The idea that I get from dogpile, is that in each module (getter.py, or
> > setter.py) there is a dictionary where the values are stored in the
> > backend. Hence, getter.py has its dictionary and setter.py has its
> > dictionary also. In the end, there is not a single dictionary where all the
> > values should be put. And I want a single dictionary.
> >
>
> Then put everything in one file. Three files for the amount of code you
> show above is nonsensical. You might like to read
> http://dirtsimple.org/2004/12/python-is-not-java.html and in response to
> that http://dirtsimple.org/2004/12/java-is-not-python-either.html
>
> --
> My fellow Pythonistas, ask not what our language can do for you, ask
> what you can do for our language.
>
> Mark Lawrence
Here is the full class that I use to store the data.
from dogpile.cache import make_region
# my_dictionary = {}
region = make_region().configure('dogpile.cache.memory')
# arguments={"cache_dict":my_dictionary})
class Cache:
@staticmethod
def save(key, value):
"""
general purpose method to save data (value) in the cache
:param key (string) key of the value to be saved in cache
:param value (any type) the value to be saved
"""
region.set(key, value)
@staticmethod
def get(key):
"""
general purpose method to get data from the cache
:param key (string) key of the data to be fetched
:return value (any type) data to be returned from the cache
"""
return region.get(key)
@staticmethod
def get_or_create(key):
"""
General purpose method to get data from the cache. If the value does
not exist, it creates a list
:param: key (string) key of the data to be fetched
:return value (any type) data to be returned from the cache
"""
return region.get_or_create(key, list)
@staticmethod
def set_job_predictions(rank_list):
Cache.save("job_predictions", rank_list)
@staticmethod
def get_job_predictions():
return Cache.get("job_predictions")
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