Context
vcontext
package provides single object Context
.
Context is dictionary like datastructure with custom access to items.
You can access your data by dot access.
Context does not wrap data in itself, rather just access them. Context has data
attribute where data is stored.
Install
vcontext is on pypi so you can simply:
pip install vcontext
__getitem__
vs __getattribute__
For Context
I have decided to use __getitem__
approach, since I wanted to have consistent dot access also to lists/tuples.
This would be impossible using __getattr__
.
Item
Item is dot-separated path to value. This item is splitted and values have following rules
- string - access to dictionary item or object attribute
- integer - access to list item
- first part must be string (since Context is a dictionary)
Example:
context = Context({
'status': 200,
'message': 'OK',
'result': [
{
'user': {
'username': 'phonkee',
'name': 'Peter Vrba'
}
}
]
})
assert context['result.0.user.username'] == 'phonkee'
assert context['status'] == 200
If the data is not found, KeyError
is raised on part of item that was not found. Context provides get
method where
you can specify default value if value is not found and that will never raise exception.
Build items:
Context would be useless if it only supported get of values. Context has support also to create/delete values on
underlying datas by given item
.
Lets build a structure from previous example:
context = Context()
context['status'] = 200
context['message'] = 'OK'
context['result.0.user.username'] = 'phonkee'
context['result.0.user.name'] = 'Peter Vrba'
assert context.data == {
'status': 200,
'message': 'OK',
'result': [
{
'user': {
'username': 'phonkee',
'name': 'Peter Vrba'
}
}
]
}
Now we try to delete item
del context['result.0']
assert len(context['result']) == 0
Isn't that cute little helper?
.keys(item=None):
Context also supports keys
method. By calling this method context traverses recursively object. It has support for
dict/list, for custom object it returns just the object key.
context = Context()
context['hello.world'] = 'yay'
assert context.keys() == ['hello.world']
api:
Context provides following methods:
-
.copy()
- deepcopies data and returns new context -
.dumps(item=None)
- dump to json, attributes:- item - item to be dumped to json
-
.items(**kwargs)
- list of key value items (tuple key, value), **kwargs passed tokeys
method -
.iteritems(**kwargs)
- generator version of items, **kwargs passed tokeys
method -
keys(item=None)
- returns list of all keys, attributes:- item - item to be dumped to json
Contribute:
Contributions are welcome, there are still a lot of parts to be enhanced.
TODO:
- add support for special list key append so we can append to list. e.g:
context['result.usernames.__append__'] = 'phonkee'
Author
Peter Vrba (phonkee)