# ๐Ÿ”† ๐ŸŽ‰ ๐Ÿ‘† ๐Ÿ’ช ๐Ÿ”ฌ โš› (๐Ÿ“Ÿ) ๐Ÿ‘ˆ ๐Ÿ”œ ๐Ÿ› ๏ธ โญ ๐Ÿˆธ **โ–ถ๏ธ ๐Ÿ†™**. ๐Ÿ‘‰ โ›“ ๐Ÿ‘ˆ ๐Ÿ‘‰ ๐Ÿ“Ÿ ๐Ÿ”œ ๐Ÿ› ๏ธ **๐Ÿ•**, **โญ** ๐Ÿˆธ **โ–ถ๏ธ ๐Ÿ“จ ๐Ÿ“จ**. ๐ŸŽ ๐ŸŒŒ, ๐Ÿ‘† ๐Ÿ’ช ๐Ÿ”ฌ โš› (๐Ÿ“Ÿ) ๐Ÿ‘ˆ ๐Ÿ”œ ๐Ÿ› ๏ธ ๐Ÿ•โ” ๐Ÿˆธ **๐Ÿคซ ๐Ÿ”ฝ**. ๐Ÿ‘‰ ๐Ÿ’ผ, ๐Ÿ‘‰ ๐Ÿ“Ÿ ๐Ÿ”œ ๐Ÿ› ๏ธ **๐Ÿ•**, **โฎ๏ธ** โœ”๏ธ ๐Ÿต ๐ŸŽฒ **๐Ÿ“š ๐Ÿ“จ**. โ†ฉ๏ธ ๐Ÿ‘‰ ๐Ÿ“Ÿ ๐Ÿ› ๏ธ โญ ๐Ÿˆธ **โ–ถ๏ธ** โœŠ ๐Ÿ“จ, & โ–ถ๏ธ๏ธ โฎ๏ธ โšซ๏ธ **๐Ÿ** ๐Ÿšš ๐Ÿ“จ, โšซ๏ธ ๐Ÿ“” ๐ŸŽ‚ ๐Ÿˆธ **๐Ÿ”†** (๐Ÿ”ค "๐Ÿ”†" ๐Ÿ”œ โš  ๐Ÿฅˆ ๐Ÿ‘ถ). ๐Ÿ‘‰ ๐Ÿ’ช ๐Ÿ“ถ โš  โš’ ๐Ÿ†™ **โ„น** ๐Ÿ‘ˆ ๐Ÿ‘† ๐Ÿ’ช โš™๏ธ ๐ŸŽ‚ ๐Ÿ“ฑ, & ๐Ÿ‘ˆ **๐Ÿ’ฐ** ๐Ÿ‘ช ๐Ÿ“จ, &/โš–๏ธ ๐Ÿ‘ˆ ๐Ÿ‘† ๐Ÿ’ช **๐Ÿงน ๐Ÿ†™** โฎ๏ธ. ๐Ÿ–ผ, ๐Ÿ’ฝ ๐Ÿ”— ๐ŸŽฑ, โš–๏ธ ๐Ÿšš ๐Ÿ”— ๐ŸŽฐ ๐Ÿซ ๐Ÿท. ## โš™๏ธ ๐Ÿ’ผ โžก๏ธ โ–ถ๏ธ โฎ๏ธ ๐Ÿ–ผ **โš™๏ธ ๐Ÿ’ผ** & โคด๏ธ ๐Ÿ‘€ โ” โŽ โšซ๏ธ โฎ๏ธ ๐Ÿ‘‰. โžก๏ธ ๐ŸŒˆ ๐Ÿ‘ˆ ๐Ÿ‘† โœ”๏ธ **๐ŸŽฐ ๐Ÿซ ๐Ÿท** ๐Ÿ‘ˆ ๐Ÿ‘† ๐Ÿ’š โš™๏ธ ๐Ÿต ๐Ÿ“จ. ๐Ÿ‘ถ ๐ŸŽ ๐Ÿท ๐Ÿ”— ๐Ÿ‘ช ๐Ÿ“จ,, โšซ๏ธ ๐Ÿšซ 1๏ธโƒฃ ๐Ÿท ๐Ÿ“ ๐Ÿ“จ, โš–๏ธ 1๏ธโƒฃ ๐Ÿ“ ๐Ÿ‘ฉโ€๐Ÿ’ป โš–๏ธ ๐Ÿ•ณ ๐ŸŽ. โžก๏ธ ๐ŸŒˆ ๐Ÿ‘ˆ ๐Ÿšš ๐Ÿท ๐Ÿ’ช **โœŠ ๐Ÿ•ฐ**, โ†ฉ๏ธ โšซ๏ธ โœ”๏ธ โœ ๐Ÿ“š **๐Ÿ’ฝ โšช๏ธโžก๏ธ ๐Ÿ’พ**. ๐Ÿ‘† ๐Ÿšซ ๐Ÿ’š โšซ๏ธ ๐Ÿ”  ๐Ÿ“จ. ๐Ÿ‘† ๐Ÿ’ช ๐Ÿ“ โšซ๏ธ ๐Ÿ” ๐ŸŽš ๐Ÿ•น/๐Ÿ“, โœ‹๏ธ ๐Ÿ‘ˆ ๐Ÿ”œ โ›“ ๐Ÿ‘ˆ โšซ๏ธ ๐Ÿ”œ **๐Ÿ“ ๐Ÿท** ๐Ÿšฅ ๐Ÿ‘† ๐Ÿƒโ€โ™‚ ๐Ÿ™… ๐Ÿง ๐Ÿ’ฏ, โคด๏ธ ๐Ÿ‘ˆ ๐Ÿ’ฏ ๐Ÿ”œ **๐ŸŒ** โ†ฉ๏ธ โšซ๏ธ ๐Ÿ”œ โœ”๏ธ โŒ› ๐Ÿท ๐Ÿ“ โญ ๐Ÿ’†โ€โ™‚ ๐Ÿ’ช ๐Ÿƒ ๐Ÿ”ฌ ๐Ÿ• ๐Ÿ“Ÿ. ๐Ÿ‘ˆ โšซ๏ธโ” ๐Ÿ‘ฅ ๐Ÿ”œ โŽ, โžก๏ธ ๐Ÿ“ ๐Ÿท โญ ๐Ÿ“จ ๐Ÿต, โœ‹๏ธ ๐Ÿ•ด โ–ถ๏ธ๏ธ โญ ๐Ÿˆธ โ–ถ๏ธ ๐Ÿ“จ ๐Ÿ“จ, ๐Ÿšซ โช ๐Ÿ“Ÿ โž– ๐Ÿ“. ## ๐Ÿ”† ๐Ÿ‘† ๐Ÿ’ช ๐Ÿ”ฌ ๐Ÿ‘‰ *๐Ÿ•ด* & *๐Ÿคซ* โš› โš™๏ธ `lifespan` ๐Ÿ”ข `FastAPI` ๐Ÿ“ฑ, & "๐Ÿ”‘ ๐Ÿ‘จโ€๐Ÿ’ผ" (๐Ÿ‘ค ๐Ÿ”œ ๐ŸŽฆ ๐Ÿ‘† โšซ๏ธโ” ๐Ÿ‘ˆ ๐Ÿฅˆ). โžก๏ธ โ–ถ๏ธ โฎ๏ธ ๐Ÿ–ผ & โคด๏ธ ๐Ÿ‘€ โšซ๏ธ โ„น. ๐Ÿ‘ฅ โœ ๐Ÿ” ๐Ÿ”ข `lifespan()` โฎ๏ธ `yield` ๐Ÿ’– ๐Ÿ‘‰: ```Python hl_lines="16 19" {!../../../docs_src/events/tutorial003.py!} ``` ๐Ÿ“ฅ ๐Ÿ‘ฅ โš– ๐Ÿ˜ฅ *๐Ÿ•ด* ๐Ÿ› ๏ธ ๐Ÿšš ๐Ÿท ๐Ÿšฎ (โŒ) ๐Ÿท ๐Ÿ”ข ๐Ÿ“– โฎ๏ธ ๐ŸŽฐ ๐Ÿซ ๐Ÿท โญ `yield`. ๐Ÿ‘‰ ๐Ÿ“Ÿ ๐Ÿ”œ ๐Ÿ› ๏ธ **โญ** ๐Ÿˆธ **โ–ถ๏ธ โœŠ ๐Ÿ“จ**, โฎ๏ธ *๐Ÿ•ด*. & โคด๏ธ, โ–ถ๏ธ๏ธ โฎ๏ธ `yield`, ๐Ÿ‘ฅ ๐Ÿšš ๐Ÿท. ๐Ÿ‘‰ ๐Ÿ“Ÿ ๐Ÿ”œ ๐Ÿ› ๏ธ **โฎ๏ธ** ๐Ÿˆธ **๐Ÿ ๐Ÿšš ๐Ÿ“จ**, โ–ถ๏ธ๏ธ โญ *๐Ÿคซ*. ๐Ÿ‘‰ ๐Ÿ’ช, ๐Ÿ–ผ, ๐Ÿš€ โ„น ๐Ÿ’– ๐Ÿ’พ โš–๏ธ ๐Ÿ’ป. !!! tip `shutdown` ๐Ÿ”œ ๐Ÿ”จ ๐Ÿ•โ” ๐Ÿ‘† **โ›”๏ธ** ๐Ÿˆธ. ๐ŸŽฒ ๐Ÿ‘† ๐Ÿ’ช โ–ถ๏ธ ๐Ÿ†• โฌ, โš–๏ธ ๐Ÿ‘† ๐Ÿคš ๐ŸŽก ๐Ÿƒ โšซ๏ธ. ๐Ÿคท ### ๐Ÿ”† ๐Ÿ”ข ๐Ÿฅ‡ ๐Ÿ‘œ ๐Ÿ‘€, ๐Ÿ‘ˆ ๐Ÿ‘ฅ โš– ๐Ÿ” ๐Ÿ”ข โฎ๏ธ `yield`. ๐Ÿ‘‰ ๐Ÿ“ถ ๐ŸŽ ๐Ÿ”— โฎ๏ธ `yield`. ```Python hl_lines="14-19" {!../../../docs_src/events/tutorial003.py!} ``` ๐Ÿฅ‡ ๐Ÿ• ๐Ÿ”ข, โญ `yield`, ๐Ÿ”œ ๐Ÿ› ๏ธ **โญ** ๐Ÿˆธ โ–ถ๏ธ. & ๐Ÿ• โฎ๏ธ `yield` ๐Ÿ”œ ๐Ÿ› ๏ธ **โฎ๏ธ** ๐Ÿˆธ โœ”๏ธ ๐Ÿ. ### ๐Ÿ” ๐Ÿ”‘ ๐Ÿ‘จโ€๐Ÿ’ผ ๐Ÿšฅ ๐Ÿ‘† โœ…, ๐Ÿ”ข ๐ŸŽ€ โฎ๏ธ `@asynccontextmanager`. ๐Ÿ‘ˆ ๐Ÿ—œ ๐Ÿ”ข ๐Ÿ”˜ ๐Ÿ•ณ ๐Ÿค™ "**๐Ÿ” ๐Ÿ”‘ ๐Ÿ‘จโ€๐Ÿ’ผ**". ```Python hl_lines="1 13" {!../../../docs_src/events/tutorial003.py!} ``` **๐Ÿ”‘ ๐Ÿ‘จโ€๐Ÿ’ผ** ๐Ÿ ๐Ÿ•ณ ๐Ÿ‘ˆ ๐Ÿ‘† ๐Ÿ’ช โš™๏ธ `with` ๐Ÿ“„, ๐Ÿ–ผ, `open()` ๐Ÿ’ช โš™๏ธ ๐Ÿ”‘ ๐Ÿ‘จโ€๐Ÿ’ผ: ```Python with open("file.txt") as file: file.read() ``` โฎ๏ธ โฌ ๐Ÿ, ๐Ÿ“ค **๐Ÿ” ๐Ÿ”‘ ๐Ÿ‘จโ€๐Ÿ’ผ**. ๐Ÿ‘† ๐Ÿ”œ โš™๏ธ โšซ๏ธ โฎ๏ธ `async with`: ```Python async with lifespan(app): await do_stuff() ``` ๐Ÿ•โ” ๐Ÿ‘† โœ ๐Ÿ”‘ ๐Ÿ‘จโ€๐Ÿ’ผ โš–๏ธ ๐Ÿ” ๐Ÿ”‘ ๐Ÿ‘จโ€๐Ÿ’ผ ๐Ÿ’– ๐Ÿ”›, โšซ๏ธโ” โšซ๏ธ ๐Ÿ”จ ๐Ÿ‘ˆ, โญ ๐Ÿ›ฌ `with` ๐Ÿซ, โšซ๏ธ ๐Ÿ”œ ๐Ÿ› ๏ธ ๐Ÿ“Ÿ โญ `yield`, & โฎ๏ธ โŽ `with` ๐Ÿซ, โšซ๏ธ ๐Ÿ”œ ๐Ÿ› ๏ธ ๐Ÿ“Ÿ โฎ๏ธ `yield`. ๐Ÿ‘† ๐Ÿ“Ÿ ๐Ÿ–ผ ๐Ÿ”›, ๐Ÿ‘ฅ ๐Ÿšซ โš™๏ธ โšซ๏ธ ๐Ÿ”—, โœ‹๏ธ ๐Ÿ‘ฅ ๐Ÿšถโ€โ™€๏ธ โšซ๏ธ FastAPI โšซ๏ธ โš™๏ธ โšซ๏ธ. `lifespan` ๐Ÿ”ข `FastAPI` ๐Ÿ“ฑ โœŠ **๐Ÿ” ๐Ÿ”‘ ๐Ÿ‘จโ€๐Ÿ’ผ**, ๐Ÿ‘ฅ ๐Ÿ’ช ๐Ÿšถโ€โ™€๏ธ ๐Ÿ‘† ๐Ÿ†• `lifespan` ๐Ÿ” ๐Ÿ”‘ ๐Ÿ‘จโ€๐Ÿ’ผ โšซ๏ธ. ```Python hl_lines="22" {!../../../docs_src/events/tutorial003.py!} ``` ## ๐ŸŽ› ๐ŸŽ‰ (๐Ÿ˜ข) !!! warning ๐Ÿ‘ ๐ŸŒŒ ๐Ÿต *๐Ÿ•ด* & *๐Ÿคซ* โš™๏ธ `lifespan` ๐Ÿ”ข `FastAPI` ๐Ÿ“ฑ ๐Ÿ”ฌ ๐Ÿ”›. ๐Ÿ‘† ๐Ÿ’ช ๐ŸŽฒ ๐Ÿšถ ๐Ÿ‘‰ ๐Ÿ•. ๐Ÿ“ค ๐ŸŽ› ๐ŸŒŒ ๐Ÿ”ฌ ๐Ÿ‘‰ โš› ๐Ÿ› ๏ธ โฎ๏ธ *๐Ÿ•ด* & โฎ๏ธ *๐Ÿคซ*. ๐Ÿ‘† ๐Ÿ’ช ๐Ÿ”ฌ ๐ŸŽ‰ ๐Ÿ•โ€๐Ÿฆบ (๐Ÿ”ข) ๐Ÿ‘ˆ ๐Ÿ’ช ๐Ÿ› ๏ธ โญ ๐Ÿˆธ โ–ถ๏ธ ๐Ÿ†™, โš–๏ธ ๐Ÿ•โ” ๐Ÿˆธ ๐Ÿคซ ๐Ÿ”ฝ. ๐Ÿ‘ซ ๐Ÿ”ข ๐Ÿ’ช ๐Ÿ“ฃ โฎ๏ธ `async def` โš–๏ธ ๐Ÿ˜ `def`. ### `startup` ๐ŸŽ‰ ๐Ÿšฎ ๐Ÿ”ข ๐Ÿ‘ˆ ๐Ÿ”œ ๐Ÿƒ โญ ๐Ÿˆธ โ–ถ๏ธ, ๐Ÿ“ฃ โšซ๏ธ โฎ๏ธ ๐ŸŽ‰ `"startup"`: ```Python hl_lines="8" {!../../../docs_src/events/tutorial001.py!} ``` ๐Ÿ‘‰ ๐Ÿ’ผ, `startup` ๐ŸŽ‰ ๐Ÿ•โ€๐Ÿฆบ ๐Ÿ”ข ๐Ÿ”œ ๐Ÿ”ข ๐Ÿฌ "๐Ÿ’ฝ" ( `dict`) โฎ๏ธ ๐Ÿ’ฒ. ๐Ÿ‘† ๐Ÿ’ช ๐Ÿšฎ ๐ŸŒ… ๐ŸŒ˜ 1๏ธโƒฃ ๐ŸŽ‰ ๐Ÿ•โ€๐Ÿฆบ ๐Ÿ”ข. & ๐Ÿ‘† ๐Ÿˆธ ๐Ÿ† ๐Ÿšซ โ–ถ๏ธ ๐Ÿ“จ ๐Ÿ“จ โญ ๐ŸŒ `startup` ๐ŸŽ‰ ๐Ÿ•โ€๐Ÿฆบ โœ”๏ธ ๐Ÿ. ### `shutdown` ๐ŸŽ‰ ๐Ÿšฎ ๐Ÿ”ข ๐Ÿ‘ˆ ๐Ÿ”œ ๐Ÿƒ ๐Ÿ•โ” ๐Ÿˆธ ๐Ÿคซ ๐Ÿ”ฝ, ๐Ÿ“ฃ โšซ๏ธ โฎ๏ธ ๐ŸŽ‰ `"shutdown"`: ```Python hl_lines="6" {!../../../docs_src/events/tutorial002.py!} ``` ๐Ÿ“ฅ, `shutdown` ๐ŸŽ‰ ๐Ÿ•โ€๐Ÿฆบ ๐Ÿ”ข ๐Ÿ”œ โœ โœ โธ `"Application shutdown"` ๐Ÿ“ `log.txt`. !!! info `open()` ๐Ÿ”ข, `mode="a"` โ›“ "๐ŸŽป",, โธ ๐Ÿ”œ ๐Ÿšฎ โฎ๏ธ โšซ๏ธโ” ๐Ÿ”› ๐Ÿ‘ˆ ๐Ÿ“, ๐Ÿต ๐Ÿ“ โฎ๏ธ ๐ŸŽš. !!! tip ๐Ÿ‘€ ๐Ÿ‘ˆ ๐Ÿ‘‰ ๐Ÿ’ผ ๐Ÿ‘ฅ โš™๏ธ ๐Ÿฉ ๐Ÿ `open()` ๐Ÿ”ข ๐Ÿ‘ˆ ๐Ÿ”— โฎ๏ธ ๐Ÿ“. , โšซ๏ธ ๐Ÿ”Œ ๐Ÿ‘ค/๐Ÿ…พ (๐Ÿ”ข/๐Ÿ”ข), ๐Ÿ‘ˆ ๐Ÿšš "โŒ›" ๐Ÿ‘œ โœ ๐Ÿ’พ. โœ‹๏ธ `open()` ๐Ÿšซ โš™๏ธ `async` & `await`. , ๐Ÿ‘ฅ ๐Ÿ“ฃ ๐ŸŽ‰ ๐Ÿ•โ€๐Ÿฆบ ๐Ÿ”ข โฎ๏ธ ๐Ÿฉ `def` โ†ฉ๏ธ `async def`. !!! info ๐Ÿ‘† ๐Ÿ’ช โœ ๐ŸŒ… ๐Ÿ”ƒ ๐Ÿ‘ซ ๐ŸŽ‰ ๐Ÿ•โ€๐Ÿฆบ ๐Ÿ’ƒ ๐ŸŽ‰' ๐Ÿฉบ. ### `startup` & `shutdown` ๐Ÿ‘ฏโ€โ™‚๏ธ ๐Ÿ“ค โ†• ๐Ÿคž ๐Ÿ‘ˆ โš› ๐Ÿ‘† *๐Ÿ•ด* & *๐Ÿคซ* ๐Ÿ”—, ๐Ÿ‘† ๐Ÿ’ช ๐Ÿ’š โ–ถ๏ธ ๐Ÿ•ณ & โคด๏ธ ๐Ÿ โšซ๏ธ, ๐Ÿ“Ž โ„น & โคด๏ธ ๐Ÿš€ โšซ๏ธ, โ™’๏ธ. ๐Ÿ”จ ๐Ÿ‘ˆ ๐Ÿ‘ฝ ๐Ÿ”ข ๐Ÿ‘ˆ ๐Ÿšซ ๐Ÿ’ฐ โš› โš–๏ธ ๐Ÿ”ข ๐Ÿ‘ฏโ€โ™‚๏ธ ๐ŸŒ… โš  ๐Ÿ‘† ๐Ÿ”œ ๐Ÿ’ช ๐Ÿช ๐Ÿ’ฒ ๐ŸŒ ๐Ÿ”ข โš–๏ธ ๐ŸŽ ๐ŸŽฑ. โ†ฉ๏ธ ๐Ÿ‘ˆ, โšซ๏ธ ๐Ÿ”œ ๐Ÿ‘ โ†ฉ๏ธ โš™๏ธ `lifespan` ๐Ÿ”ฌ ๐Ÿ”›. ## ๐Ÿ“ก โ„น ๐Ÿ“ก โ„น ๐Ÿ˜Ÿ ๐Ÿค“. ๐Ÿ‘ถ ๐Ÿ”˜, ๐Ÿ”ซ ๐Ÿ“ก ๐Ÿ”ง, ๐Ÿ‘‰ ๐Ÿ• ๐Ÿ”† ๐Ÿ› ๏ธ, & โšซ๏ธ ๐Ÿ”ฌ ๐ŸŽ‰ ๐Ÿค™ `startup` & `shutdown`. ## ๐ŸŽง ๐Ÿˆธ ๐Ÿ‘ถ โœ”๏ธ ๐Ÿคฏ ๐Ÿ‘ˆ ๐Ÿ‘ซ ๐Ÿ”† ๐ŸŽ‰ (๐Ÿ•ด & ๐Ÿคซ) ๐Ÿ”œ ๐Ÿ•ด ๐Ÿ› ๏ธ ๐Ÿ‘‘ ๐Ÿˆธ, ๐Ÿšซ [๐ŸŽง ๐Ÿˆธ - ๐Ÿ—ป](./sub-applications.md){.internal-link target=_blank}.