```Python
async with lifespan(app):
    await do_stuff()
```

Wenn Sie wie oben einen Kontextmanager oder einen asynchronen Kontextmanager erstellen, führt dieser vor dem Betreten des `with`-Blocks den Code vor dem `yield` aus, und nach dem Verlassen des `with`-Blocks wird er den Code nach dem `yield` ausführen.

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3.internal.ws

import assertk.assertThat
import assertk.assertions.isBetween
import assertk.assertions.isCloseTo
import assertk.assertions.isEmpty
import assertk.assertions.isEqualTo
import assertk.assertions.isFalse
import assertk.assertions.isInstanceOf
import assertk.assertions.isLessThan

Ich zeige Ihnen später in einem Abschnitt unten ein Beispiel unter Verwendung von Poetry. 👇

///

### Den **FastAPI**-Code erstellen

* Erstellen Sie ein `app`-Verzeichnis und betreten Sie es.
* Erstellen Sie eine leere Datei `__init__.py`.
* Erstellen Sie eine `main.py`-Datei mit:

```Python
from typing import Union

from fastapi import FastAPI

app = FastAPI()

ce.fn.extend({css:function(e,t){return M(this,function(e,t,n){var r,i,o={},a=0;if(Array.isArray(t)){for(r=Xe(e),i=t.length;a<i;a++)o[t[a]]=ce.css(e,t[a],!1,r);return o}return void 0!==n?ce.style(e,t,n):ce.css(e,t)},e,t,1<arguments.length)}}),((ce.Tween=at).prototype={constructor:at,init:function(e,t,n,r,i,o){this.elem=e,this.prop=n,this.easing=i||ce.easing._default,this.options=t,this.start=this.now=this.cur(),this.end=r,this.unit=o||(ce.cssNumber[n]?"":"px")},cur:function(){var e=at.propHooks[this.prop];return...

e","startLength","hooks","_queueHooks","unshift","stop","setter","clearQueue","tmp","count","defer","pnum","source","rcssNum","cssExpand","isAttached","composed","getRootNode","isHiddenWithinTree","style","display","css","adjustCSS","valueParts","tween","adjusted","scale","maxIterations","currentValue","initial","unit","cssNumber","initialInUnit","defaultDisplayMap","showHide","show","values","body","hide","toggle","div","rcheckableType","rtagName","rscriptType","createDocumentFragment","checkCl...

 Jb(this,!0)},hide:function(){return Jb(this)},toggle:function(a){return"boolean"==typeof a?a?this.show():this.hide():this.each(function(){S(this)?n(this).show():n(this).hide()})}});function Kb(a,b,c,d,e){return new Kb.prototype.init(a,b,c,d,e)}n.Tween=Kb,Kb.prototype={constructor:Kb,init:function(a,b,c,d,e,f){this.elem=a,this.prop=c,this.easing=e||"swing",this.options=b,this.start=this.now=this.cur(),this.end=d,this.unit=f||(n.cssNumber[c]?"":"px")},cur:function(){var a=Kb.propHooks[this.prop];return...

ce.fn.extend({css:function(e,t){return M(this,function(e,t,n){var r,i,o={},a=0;if(Array.isArray(t)){for(r=Xe(e),i=t.length;a<i;a++)o[t[a]]=ce.css(e,t[a],!1,r);return o}return void 0!==n?ce.style(e,t,n):ce.css(e,t)},e,t,1<arguments.length)}}),((ce.Tween=at).prototype={constructor:at,init:function(e,t,n,r,i,o){this.elem=e,this.prop=n,this.easing=i||ce.easing._default,this.options=t,this.start=this.now=this.cur(),this.end=r,this.unit=o||(ce.cssNumber[n]?"":"px")},cur:function(){var e=at.propHooks[this.prop];return...

e","startLength","hooks","_queueHooks","unshift","stop","setter","clearQueue","tmp","count","defer","pnum","source","rcssNum","cssExpand","isAttached","composed","getRootNode","isHiddenWithinTree","style","display","css","adjustCSS","valueParts","tween","adjusted","scale","maxIterations","currentValue","initial","unit","cssNumber","initialInUnit","defaultDisplayMap","showHide","show","values","body","hide","toggle","div","rcheckableType","rtagName","rscriptType","createDocumentFragment","checkCl...

arsePostFormat","time","formats","isCalendarSpec","sod","startOf","calendarFormat","asFloat","that","zoneDelta","endOf","startOfDate","isoWeekday","inputString","postformat","withoutSuffix","humanize","fromNow","toNow","invalidAt","localInput","isBetween","inclusivity","localFrom","localTo","isSame","inputMs","isSameOrAfter","isSameOrBefore","parsingFlags","prioritized","unitsObj","u","getPrioritizedUnits","toArray","toObject","toDate","toISOString","keepOffset","inspect","prefix","suffix","zone...

ueOf()<this.clone().startOf(a).valueOf())},yt.isBefore=function(e,a){var t=D(e)?e:Ha(e);return!(!this.isValid()||!t.isValid())&&("millisecond"===(a=N(a)||"millisecond")?this.valueOf()<t.valueOf():this.clone().endOf(a).valueOf()<t.valueOf())},yt.isBetween=function(e,a,t,s){var n=D(e)?e:Ha(e),r=D(a)?a:Ha(a);return!!(this.isValid()&&n.isValid()&&r.isValid())&&(("("===(s=s||"()")[0]?this.isAfter(n,t):!this.isBefore(n,t))&&(")"===s[1]?this.isBefore(r,t):!this.isAfter(r,t)))},yt.isSame=function(e,a){var...