Linked Dictionary
Advanced python dictionary(hash-table), which can link it-self keys and make calculations into the keys of the dict
Installation
Use the package manager pip to install foobar.
pip install linked_dictUsage
The syntax of expressions:
{'key' : '...$(expression)$...'}Initialization:
from linked_dict import LinkedDict
from json import dumps
dictionary = LinkedDict({}) # {} - your dictExamples:
Simple link:
example = LinkedDict(
{
'a': 5,
'b': '$(a)$'
}
)
print(dumps(example))
{
'a': 5,
'b': 5
}Expression with one key. As you can see now I added a space outside this expression, and the final value is string:
example = LinkedDict(
{
'a': 5,
'b': '$(a * 2)$ ' # here with a space
}
)
print(dumps(example))
{
'a': 5,
'b': '10 '
}Link other expressions:
example = LinkedDict(
{
'a': 5,
'b': 100,
'c': '$(b + d)$',
'd': '$(b + a)$'
}
)
print(dumps(example))
{
'a': 5,
'b': 100,
'c': 205,
'd': 105
}Using all built-in types:
example = LinkedDict(
{
'a': ['one_item'],
'b': '$(a + ["another_item"])$'
}
)
print(dumps(example))
{
'a': ['one_item'],
'b': ['one_item', 'another_item']
}Using your own functions into expressions:
some_func = lambda arg: arg + 1
example = LinkedDict(
{
'a': 5,
'b': '$(some_func(a))$'
}
)
print(dumps(example))
{
'a': 5,
'b': 5
}Changing:
When you change a value, all values that link it change their values too. But links work only in one direction
example = LinkedDict(
{
'a': 5,
'b': '$(a)$'
}
)
print(example)
# >>> {'a': 5, 'b': 5}
example['a'] = 'another_val'
print(example)
# >>> {'a': 'another_val', 'b': 'another_val'}
example['b'] = '4'
print(example)
# >>> {'a': 'another_val', 'b': 4}
# !!! 'b' links 'a', but 'a' doesn't link 'b'Warning:
1. Keys of your dict must be only strings
{5: 'abc', True: []} # is prohibited
{'5': 'abc', 'True': []} # is allowed2. Don't make loops of links. Dictionary is protected of this, but you will get the Error
Contributing:
Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.
Please make sure to update tests as appropriate.
