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Commit13d0511

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dataclass to README.md, jn and index
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‎README.md‎

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-[`__main__` Top-level script environment](#main-top-level-script-environment)
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-[Advantages](#advantages)
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-[setup.py](#setuppy)
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-[Dataclasses](#dataclasses)
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-[Features](#features)
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-[Virtual Environment](#virtual-environment)
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-[virtualenv](#virtualenv)
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-[pipenv](#pipenv)
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[*Return to the Top*](#python-cheatsheet)
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## Dataclasses
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`Dataclasses` are python classes but are suitedfor storing data objects.
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This module provides a decoratorand functionsfor automatically adding generated special methods suchas`__init__()`and`__repr__()` to user-defined classes.
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### Features
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1. They store dataand represent a certain datatype. Ex: A number. For people familiarwith ORMs, a model instanceis a dataobject. It represents a specific kind of entity. It holds attributes that defineor represent the entity.
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2. They can be compared to other objects of the sametype. Ex: A number can be greater than, less than,or equal to another number.
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Python3.7 provides a decorator dataclass thatis used to convert aclass into a dataclass.
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python2.7
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```python
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>>>class Number:
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...def__init__(self, val):
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...self.val= val
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...
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>>>obj= Number(2)
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>>> obj.val
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2
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```
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with dataclass
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```python
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>>>@dataclass
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...class Number:
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... val:int
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...
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>>>obj= Number(2)
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>>> obj.val
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2
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```
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[*Return to the Top*](#python-cheatsheet)
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## Virtual Environment
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The use of a Virtual Environmentis to test python codein encapsulated environmentsand to also avoid filling the base Python installationwith libraries we might usefor only one project.

‎blog_files/index.md‎

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-[Context Manager](#context-manager)
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- <ahref="#__main__-Top-level-script-environment">__main__ Top-level script environment</a>
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-[setup.py](#setup.py)
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-[Dataclasses](#dataclasses)
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-[Virtual Environment](#virtual-environment)

‎blog_files/pysheet.md‎

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Find more information visit [http://docs.python.org/install/index.html](http://docs.python.org/install/index.html).
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## Dataclasses
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```Dataclasses``` are python classes but are suitedfor storing data objects.
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This module provides a decoratorand functionsfor automatically adding generated special methods suchas```__init__()```and```__repr__()``` to user-defined classes.
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`Dataclasses` are python classes but are suitedfor storing data objects.
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This module provides a decoratorand functionsfor automatically adding generated special methods suchas`__init__()`and`__repr__()` to user-defined classes.
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### Features
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Python3.7 provides a decorator dataclass thatis used to convert aclass into a dataclass.
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python2.7
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```python
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>>>class Number:
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...def__init__(self, val):
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>>> obj.val
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2
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```
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with dataclass
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```python
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>>> obj.val
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2
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```
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## Virtual Environment
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The use of a Virtual Environmentis to test python codein encapsulated environmentsand to also avoid filling the base Python installationwith libraries we might usefor only one project.

‎python_cheat_sheet.ipynb‎

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"- [`__main__` Top-level script environment](#main-top-level-script-environment)\n",
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" - [Advantages](#advantages)\n",
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"- [setup.py](#setuppy)\n",
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"- [Dataclasses](#dataclasses)\n",
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" - [Features](#features)\n",
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"- [Virtual Environment](#virtual-environment)\n",
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" - [virtualenv](#virtualenv)\n",
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" - [pipenv](#pipenv)\n",
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"source": [
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"Find more information visit [http://docs.python.org/install/index.html](http://docs.python.org/install/index.html).\n",
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"\n",
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"[*Return to the Top*](#python-cheatsheet)\n",
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"\n",
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"## Dataclasses\n",
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"\n",
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"`Dataclasses` are python classes but are suited for storing data objects.\n",
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"This module provides a decorator and functions for automatically adding generated special methods such as `__init__()` and `__repr__()` to user-defined classes.\n",
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"\n",
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"### Features\n",
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"\n",
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"1. They store data and represent a certain data type. Ex: A number. For people familiar with ORMs, a model instance is a data object. It represents a specific kind of entity. It holds attributes that define or represent the entity.\n",
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"\n",
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"2. They can be compared to other objects of the same type. Ex: A number can be greater than, less than, or equal to another number.\n",
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"\n",
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"Python 3.7 provides a decorator dataclass that is used to convert a class into a dataclass.\n",
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"\n",
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"python 2.7"
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]
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},
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{
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"cell_type":"code",
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"execution_count":null,
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"metadata": {},
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"outputs": [],
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"source": [
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">>> class Number:\n",
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"... def __init__(self, val):\n",
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"... self.val = val\n",
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"...\n",
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">>> obj = Number(2)\n",
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">>> obj.val\n",
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"2"
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]
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},
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{
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"cell_type":"markdown",
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"metadata": {},
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"source": [
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"with dataclass"
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]
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},
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{
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"cell_type":"code",
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"execution_count":null,
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"metadata": {},
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"outputs": [],
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"source": [
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">>> @dataclass\n",
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"... class Number:\n",
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"... val: int\n",
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"...\n",
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">>> obj = Number(2)\n",
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">>> obj.val\n",
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"2"
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]
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},
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{
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"cell_type":"markdown",
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"metadata": {},
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"source": [
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"[*Return to the Top*](#python-cheatsheet)\n",
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"\n",
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"## Virtual Environment\n",

‎python_cheat_sheet.pdf‎

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