* http://gee.cs.oswego.edu/cgi-bin/viewcvs.cgi/jsr166/src/test/tck/AbstractExecutorServiceTest.java?revision=1.30
 * which contained the following notice:
 *
 * Written by Doug Lea with assistance from members of JCP JSR-166
 * Expert Group and released to the public domain, as explained at
 * http://creativecommons.org/publicdomain/zero/1.0/
 * Other contributors include Andrew Wright, Jeffrey Hayes,
 * Pat Fisher, Mike Judd.
 */

 * http://gee.cs.oswego.edu/cgi-bin/viewcvs.cgi/jsr166/src/test/tck/AbstractExecutorServiceTest.java?revision=1.30
 * which contained the following notice:
 *
 * Written by Doug Lea with assistance from members of JCP JSR-166
 * Expert Group and released to the public domain, as explained at
 * http://creativecommons.org/publicdomain/zero/1.0/
 * Other contributors include Andrew Wright, Jeffrey Hayes,
 * Pat Fisher, Mike Judd.
 */

**FastAPI** is all based on these type hints, they give it many advantages and benefits.

But even if you never use **FastAPI**, you would benefit from learning a bit about them.

/// note

If you are a Python expert, and you already know everything about type hints, skip to the next chapter.

///

## Motivation { #motivation }

Let's start with a simple example:

{* ../../docs_src/python_types/tutorial001_py39.py *}

  private static int ceilToPowerOfTwo(int x) {
    return 1 << IntMath.log2(x, RoundingMode.CEILING);
  }

  /*
   * This method was written by Doug Lea with assistance from members of JCP JSR-166 Expert Group
   * and released to the public domain, as explained at
   * http://creativecommons.org/licenses/publicdomain
   *
   * As of 2010/06/11, this method is identical to the (package private) hash method in OpenJDK 7's

채팅 시스템에서의 대화 또한 GitHub에서 처럼 쉽게 검색할 수 없기 때문에 대화 중에 질문과 답변이 손실될 수 있습니다. 그리고 GitHub 이슈에 있는 것만 [FastAPI Expert](fastapi-people.md#fastapi-experts){.internal-link target=_blank}가 되는 것으로 간주되므로, GitHub 이슈에서 더 많은 관심을 받을 것입니다.

반면, 채팅 시스템에는 수천 명의 사용자가 있기 때문에, 거의 항상 대화 상대를 찾을 가능성이 높습니다. 😄

## 개발자 스폰서가 되십시오

   * which contained the following notice:
   *
   * Written by Doug Lea with assistance from members of JCP JSR-166 Expert Group and released to
   * the public domain, as explained at http://creativecommons.org/publicdomain/zero/1.0/
   *
   * Other contributors include Andrew Wright, Jeffrey Hayes, Pat Fisher, Mike Judd.
   */

  /**

/*
 * Written by Doug Lea with assistance from members of JCP JSR-166
 * Expert Group and released to the public domain, as explained at
 * http://creativecommons.org/publicdomain/zero/1.0/
 * Other contributors include Andrew Wright, Jeffrey Hayes,
 * Pat Fisher, Mike Judd.
 */

/*
 * Source:
 * http://gee.cs.oswego.edu/cgi-bin/viewcvs.cgi/jsr166/src/test/tck/JSR166TestCase.java?revision=1.90

// https://www.iana.org/domains/root/db/events.html
events

// exchange : Binky Moon, LLC
// https://www.iana.org/domains/root/db/exchange.html
exchange

// expert : Binky Moon, LLC
// https://www.iana.org/domains/root/db/expert.html
expert

// exposed : Binky Moon, LLC
// https://www.iana.org/domains/root/db/exposed.html
exposed

// express : Binky Moon, LLC

execute-api.us-east-2.amazonaws.com
execute-api.us-gov-east-1.amazonaws.com
execute-api.us-gov-west-1.amazonaws.com
execute-api.us-west-1.amazonaws.com
execute-api.us-west-2.amazonaws.com
exnet.su
expert
experts-comptables.fr
expo.app
exposed
express
express.aero
express.val.run
extraspace
ezproxy.kuleuven.be
f.bg
f.se
f5.si
fage
fail
fairwinds
faith

execute-api.us-east-2.amazonaws.com
execute-api.us-gov-east-1.amazonaws.com
execute-api.us-gov-west-1.amazonaws.com
execute-api.us-west-1.amazonaws.com
execute-api.us-west-2.amazonaws.com
exnet.su
expert
experts-comptables.fr
expo.app
exposed
express
express.aero
express.val.run
extraspace
ezproxy.kuleuven.be
f.bg
f.se
f5.si
fage
fail
fairwinds
faith