# Pierwsze kroki

Najprostszy plik FastAPI może wyglądać tak:

{* ../../docs_src/first_steps/tutorial001.py *}

Skopiuj to do pliku `main.py`.

Uruchom serwer:

<div class="termy">

```console
$ uvicorn main:app --reload

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
<span style="color: green;">INFO</span>:     Started reloader process [28720]

	// Hex constant 0xFFFFFFFF80000001
	MOVD $-2147483647, R5           // 3ca0800060a50001 or 0603800038a00001
	// Hex constant 0xFFFFFFFE00000002 (load of constant on < power10, pli on >= power10
	MOVD $-8589934590, R5           // 3ca00000e8a50000 or 0602000038a00002

	// For backwards compatibility, MOVW $const,Rx and MOVWZ $const,Rx assemble identically
	// and accept the same constants.