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How should I use the Optional type hint?

Hello Guys, How are you all? Hope You all Are Fine. Today We Are Going To learn about How should I use the Optional type hint in Python. So Here I am Explain to you all the possible Methods here.

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Table of Contents

How should I use the Optional type hint?

  1. How should I use the Optional type hint?

  2. “Optional[str] is just a shorthand or alias for Union[str, None]. It exists mostly as a convenience to help function signatures look a little cleaner.”
  3. should I use the Optional type hint

  4. “Optional[str] is just a shorthand or alias for Union[str, None]. It exists mostly as a convenience to help function signatures look a little cleaner.”

Method 1

Directly from mypy typing module docs.

  • “Optional[str] is just a shorthand or alias for Union[str, None]. It exists mostly as a convenience to help function signatures look a little cleaner.”

Method 2

Up until Python 3.9 if you wanted to hint for a nullable value you had two options:

import typing

def foo(bar: typing.Optional[str]):
    ....

def foo(bar: typing.Union[str, None]):
    ....

From Python 3.9 you are not required to use typing module:

def foo(bar: str = None):
    ....

Summery

It’s all About this issue. Hope all Methods helped you a lot. Comment below Your thoughts and your queries. Also, Comment below which Method worked for you? Thank You.

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