Extra core collecions package additionals.
Project description
Some extra python data containers (extra collections).
This project extends python`s core library collections
module.
Getting started.
Installation.
We have no pypi account yet and we have no private pypi repository.
So, you should install this package as usual with pip
package manager in
virtualenv or just globally from source:
pip install git+https://bitbucket.org/bfg-soft/collections_extension.git
If you want to install specific version or branch, you should execute:
pip install git+https://bitbucket.org/bfg-soft/collections_extension.git@v0.1.0
Content.
Native-like containers.
As we know, it is not recommended to inherit your own types from python`s
core types like dict
or tuple
.
This package provides some native-like types, such as:
Tuple
-tuple
-like container for user types (immutable),List
-list
-like container for user types (mutable),Dict
-dict
-like container for user types (mutable),Map
-MappingProxyType
-like (dict
without mutability) container for user types (immutable),Set
-set
-like container for user types (mutable)
Exception map container.
Container implements map of exception classes with inheritance check during
searching key in map. For example, we have ExceptionMap
:
from collections_extension import ExceptionMap
m = ExceptionMap({ValueError: 'somevalue'})
Imagine, that we catch UnicodeError
somewere in program and we want to
process it. Our processing is based on defined ExceptionMap
m
and we
want to know what value we should send futher to the program runtime.
from collections_extension import ExceptionMap
m = ExceptionMap({ValueError: 'somevalue'})
...
def somefn():
try:
...
except UnicodeError:
value = m[UnicodeError]
except TypeError:
value = m.get(TypeError)
if value is None:
raise
else:
value = None
return value
ExceptionMap
will search the hierarchy of key exception until it comes to
Exception
class. Only after that, map will raise KeyError
exception.
Our map doesn`t contain UnicodeError
key, but it contains
ValueError
. We know, that UnicodeError
inherits ValueError
exception class, so value
during handling UnicodeError
will be
assigned to somevalue
string.
During handling of TypeError
exception we use method get
of
ExceptionMap
. It doesn`t raise any exception, like method of type
dict
and returns default value (second argument, that should be passing to
the method) or None
.
Becides that, ExceptionMap
allow to defined default_value
during it`s
initialization like:
from collections_extension import ExceptionMap
m = ExceptionMap({ValueError: 'somevalue'}, default_value='not none')
It overrides default value None
, that will be returned when key does not
exist and not default value has been passed.
Sqlalchemy declarative model map container.
Container implements map of sqlalchemy declarative meta classes as values and their tablenames as keys.
For example, you have module your_package.data.model
with sqlalchemy
declarative models.
You can make map of declarative models withthis code:
from collections_extension import SqlalchemyModelMap
MODEL_MAP = SqlalchemyModelMap.from_module_name('your_package.data.model')
After that, you can find all declarative model classes in this map (if your
structured module correctly) by their tablename. For example
MODEL_MAP['my_table']
will get you declarative model for my_table
table.
Sqlalchemy declarative model schema map container.
Container implements map of marshmallow schema instances as values and tablenames of declarative model classes as keys.
Each marshmallow schema creates with special library marshmallow-sqlalchemy, which inspects declarative model classes and makes schema class as a result.
Typical usage:
from collections_extension import SqlalchemyModelMap, SqlalchemyModelSchemaMap
MODEL_MAP = SqlalchemyModelMap.from_module_name('your_package.data.model')
MODEL_SCHEMA_MAP = SqlalchemyModelSchemaMap.from_sqlalchemy_model_map(MODEL_MAP)
License.
This project is licensed under the MIT License - see the LICENSE.txt file for details.
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