nyoibo 0.4.0

Implement attributes accessors in an easy way

Nyoibo is an easy way to avoid repetitive code with “private” attributes in Python.

See full documentation

Installation

You can install nyoibo with pip. Nyoibo requires python 3.7 or higer.

pip install nyoibo

What does “nyoibo” mean?

Nyoibo is a mystical staff given to Son Goku by his grandfather Son Gohan.

Usage

Instead of doing this:

class Example:

    def __init__(self, value=None, other_value=None, default='hello')
        self._value = value
        self._other_value = other_value
        self._default = default

    def get_value(self):
        return self._value

    value = property(get_value)

    def get_other_value(self):
        return self._other_value

    def set_other_value(self, value):
        self._other_value = value

    other_value = property(get_other_value, set_other_value)

    def do_something(self):
        return f'{self._default} world'

You can do this:

from nyoibo import Entity, fields


class Example(Entity):
    _value = fields.StrField()
    _other_value = fields.IntField(immutable=False)
    _default = fields.StrField(private=True, default_value='hello')

    def do_something(self):
        return f'{self._default} world'

In both cases you could use this code like this:

example = Example(value='some value', other_value=10)

assert example.value == 'some value'
assert example.get_value() == 'some value'
assert example.get_other_value() == 10
example.other_value = 15
assert example.get_other_value() == 15
assert example.do_something() == 'hello world'

Why not use dataclass decorator?

@dataclass decorator helps to avoid to write the __init__ method but if you want to use this approach (information hiding and encapsulation), you need to write getters and setters anyway. Furthermore, with nyoibo you get extra features like casting to right value (due to static typing), validations (coming soon), override __init__ method and so on.

Above example with dataclass decorator:

from dataclasses import dataclass


@dataclass
class Example:
    _value: str
    _other_value: int
    _default: str = 'hello'

    def get_value(self):
        return self._value

    value = property(get_value)

    def get_other_value(self):
        return self._other_value

    def set_other_value(self, value):
        self._other_value = value

    other_value = property(get_other_value, set_other_value)

    def do_something(self):
        return f'{self._default} world'

Even this code doesn’t work becasue __init__ method has _value, _other_value and _default arguments. Therefore the instantation will be:

example = Example(_value='some value', _other_value=10)

License

Distributed under the terms of the LGPLv3 license.

See license.