owlmixin 1.0.0rc2

Mixin which converts ``data class instance`` and others each other more simple.

Mixin which converts data class instance and others each other more simple.

Motivation

Have you ever wanted to write robust code in Python? This library will make such your wishes come true.

Define your data class which is extend OwlMixin, you can use some useful methods which help your codes robust. See following Example and API sections.

Example

You don’t need to use typing necessarily, but I recommend to use this to make your codes more robust. See PEP 484 – Type Hints.

from typing import Text, Optional
from owlmixin import OwlMixin, TList

class Food(OwlMixin):
    def __init__(self, id, name, color=None):
        self.id = id  # type: Text
        self.name = name  # type: Text
        self.color = color  # type: Optional[Text]

class Human(OwlMixin):
    def __init__(self, id, name, favorite):
        self.id = id  # type: Text
        self.name = name  # type: Text
        self.favorite = Food.from_dicts(favorite)  # type: TList[Food]

jiro = Human.from_dict({
    "id": 10,
    "name": "jiro",
    "favorite": [
        {"id": 1, "name": "apple"},
        {"id": 2, "name": "orange", "color": "white"}
    ]
})

>>> jiro.id
10
>>> jiro.name
'jiro'
>>> print(jiro.favorite[0].to_pretty_json())
{
    "id": 1,
    "name": "apple"
}
>>> print(jiro.to_dict(ignore_none=False))
{'favorite': [{'id': 1, 'name': 'apple'}, {'color': 'white', 'id': 2, 'name': 'orange'}], 'id': 10, 'name': 'jiro'}
>>> print(jiro.to_dict())
{'favorite': [{'color': None, 'id': 1, 'name': 'apple'}, {'color': 'white', 'id': 2, 'name': 'orange'}], 'id': 10, 'name': 'jiro'}

You can also use methods chains as following.

from typing import Optional
from owlmixin import OwlMixin, TList

# `**extra` is necessary to allow extra elements.
# Note that you must define all properties in github response json if you don't use `**extra`
class Repository(OwlMixin):
    def __init__(self, id, name, description, stargazers_count, **extra):
        self.id = id  # type: int
        self.name = name  # type: Text
        self.description = description  # type: Optional[Text]
        self.star_count = stargazers_count  # type: int

class GithubRepository(OwlMixin):
    def __init__(self, total_count, incomplete_results, items):
        self.total_count = total_count  # type: int
        self.incomplete_results = incomplete_results  # type: bool
        self.repositories = Repository.from_dicts(items)  # type: TList[Repository]

>>> r = GithubRepository \
...         .from_json_url("https://api.github.com/search/repositories?q=git") \
...         .repositories \
...         .filter(lambda x: x.star_count > 100) \
...         .order_by(lambda x: x.star_count, True) \
...         .map(lambda x: {
...             "id": x.id,
...             "message": '★{0.star_count}   {0.name}'.format(x)
...         }) \
...         .to_csv(fieldnames=["id", "message"], with_header=True)
>>> print(r)
id,message
1062897,★45252   gitignore
36502,★15888   git
36560369,★2931   my-git
18484639,★212   git

API

From instance to another

• to_dict

  • instance => dict

  • TDict[instance] => dict

• to_dicts

  • TList[instance] => List[dict]

• to_json

  • instance => json string

• to_pretty_json

  • instance => json string (has indent and line break)

• to_yaml

  • instance => yaml string

• to_csv

  • TList[instance] => csv string

From something to instance

• from_dict [1] [2]

  • dict => instance

• from_optional_dict [1] [2]

  • Optional[dict] => Optional[instance]

• from_dicts [1] [2]

  • List[dict] => TList[instance]

• from_optional_dicts [1] [2]

  • Optional[List[dict]] => Optional[TList[instance]]

• from_dicts_by_key [1] [2]

  • dict => TDict[instance]

• from_optional_dicts_by_key [1] [2]

  • Optional[dict] => Optional[TDict[instance]]

• from_json [1] [2]

  • json string => instance

• from_json_to_list [1] [2]

  • json string => TList[instance]

• from_json_url [1] [2]

  • url (which returns json) => instance

• from_yaml [1] [2]

  • yaml string or file => instance

• from_yaml_to_list [1] [2]

  • yaml string or file => TList[instance]

• from_csv [1] [2] [3]

  • csv file => TList[instance]

[1] (1,2,3,4,5,6,7,8,9,10,11,12)

Keys are transformed to snake case in order to compliant PEP8. (set force_snake_case=False if you don’t want to do it.)

[2] (1,2,3,4,5,6,7,8,9,10,11,12)

Key self is transformed to _self in order to avoid duplicate.

[3]

You can specify any encodings

Installation

pip install owlmixin