blocks|key|2057959|text|TL;DR|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2057960|在文件名前面添加目录名|2057961|uvicorn+src.main:app+|code-block|syntax|javascript|2057962|或进入该目录的cd|offset|length|style|CODE|2057963|cd+src
uvicorn+main:app+|2057964|长答案|2057965|之所以会发生这种情况，是因为您与您的FastAPI应用程序实例不在同一个文件夹中，具体而言：|2057966|假设我有这样一个应用程序树；|2057967|my_fastapi_app/
├──+app.yaml
├──+docker-compose.yml
├──+src
│  +└──+main.py
└──+tests
++++├──+test_xx.py
++++└──+test_yy.py

$+pwd+++++++++#+Present+Working+Directory
/home/yagiz/Desktop/my_fastapi_app|2057968|我和我的app实例不在同一个文件夹中，所以如果我尝试用uvicorn运行我的应用程序，我会得到一个类似于您的错误|2057969|$+uvicorn+main:app+--reload
INFO:+++++Uvicorn+running+on+http://127.0.0.1:8000+(Press+CTRL%2BC+to+quit)
INFO:+++++Started+reloader+process+[40645]+using+statreload
ERROR:++++Error+loading+ASGI+app.+Could+not+import+module+"main".|2057970|答案非常简单，请在文件名前面添加文件夹名。|2057971|uvicorn+src.main:app+--reload|2057972|或者您可以更改工作目录。|2057973|cd+src+|2057974|现在我用我的app实例在文件夹中|2057975|src
└──+main.py|2057976|再次运行你的uvicorn|2057977|$+uvicorn+main:app+--reload
INFO:+++++Uvicorn+running+on+http://127.0.0.1:8000+(Press+CTRL%2BC+to+quit)
INFO:+++++Started+reloader+process+[40726]+using+statreload
INFO:+++++Started+server+process+[40728]
INFO:+++++Waiting+for+application+startup.
INFO:+++++Application+startup+complete.|2057978|entityMap^0|0|0|0|7|2|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|1M|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|1N|8|@$K|1O|L|1P|M|N]]|9|@]|A|$]]|$1|O|3|P|5|F|7|1Q|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|1R|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1S|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|1T|8|@]|9|@]|A|$]]|$1|W|3|X|5|F|7|1U|8|@]|9|@]|A|$G|H]]|$1|Y|3|Z|5|6|7|1V|8|@]|9|@]|A|$]]|$1|10|3|11|5|F|7|1W|8|@]|9|@]|A|$G|H]]|$1|12|3|13|5|6|7|1X|8|@]|9|@]|A|$]]|$1|14|3|15|5|F|7|1Y|8|@]|9|@]|A|$G|H]]|$1|16|3|17|5|6|7|1Z|8|@]|9|@]|A|$]]|$1|18|3|19|5|F|7|20|8|@]|9|@]|A|$G|H]]|$1|1A|3|1B|5|6|7|21|8|@]|9|@]|A|$]]|$1|1C|3|1D|5|F|7|22|8|@]|9|@]|A|$G|H]]|$1|1E|3|1F|5|6|7|23|8|@]|9|@]|A|$]]|$1|1G|3|1H|5|F|7|24|8|@]|9|@]|A|$G|H]]|$1|1I|3|-4|5|6|7|25|8|@]|9|@]|A|$]]]|1J|$]]

<h1>TL;DR</h1>
Add the directory name in front of your filename
<pre class="lang-py prettyprint-override"><code>uvicorn src.main:app 
</code></pre>
or <code>cd</code> into that directory
<pre class="lang-py prettyprint-override"><code>cd src
uvicorn main:app 
</code></pre>
<h1>Long Answer</h1>
It happens because you are not in the same folder with your FastAPI app instance more specifically:
Let's say i have an app-tree like this;
<pre><code>my_fastapi_app/
├── app.yaml
├── docker-compose.yml
├── src
│   └── main.py
└── tests
 ├── test_xx.py
 └── test_yy.py

$ pwd # Present Working Directory
/home/yagiz/Desktop/my_fastapi_app
</code></pre>
I'm not inside the same folder with my app instance, so if I try to run my app with uvicorn I'll get an error like yours
<pre><code>$ uvicorn main:app --reload
INFO: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
INFO: Started reloader process [40645] using statreload
ERROR: Error loading ASGI app. Could not import module &quot;main&quot;.
</code></pre>
The answer is so simple, add the folder name in front of your filename
<pre><code>uvicorn src.main:app --reload
</code></pre>
or you can change your working directory
<pre><code>cd src 
</code></pre>
Now i'm inside of the folder with my app instance
<pre><code>src
└── main.py
</code></pre>
Run your uvicorn again
<pre><code>$ uvicorn main:app --reload
INFO: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
INFO: Started reloader process [40726] using statreload
INFO: Started server process [40728]
INFO: Waiting for application startup.
INFO: Application startup complete.
</code></pre>

blocks|key|99927|text|我也遇到了同样的问题，并在main之前添加了包名，在您的示例中尝试：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|99928|uvicorn+src.main:app+--reload|code-block|syntax|javascript|99929|可以解决问题|99930|entityMap^0|0|Y|0|0|0|6|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

I had the same problem and solved it adding package name before main, in your case trying:
<pre><code>uvicorn src.main:app --reload
</code></pre>
may solve the problem

blocks|key|99958|text|这对我来说很管用，看那些医生给fastAPI。我非常感谢我已经完成了这个任务，因为Python脚本需要命名为main.py，而不是app.py|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|99959|命令uvicorn+main:app指的是：|99960|main：文件main.py+(main.py“模块”)。|ordered-list-item|99961|app：在main.py内部创建的带有行app+=+FastAPI()的对象|99962|--reload：在代码更改后重新启动服务器。只用于发展。|99963|entityMap|0|LINK|mutability|MUTABLE|url|https://fastapi.tiangolo.com/tutorial/first-steps/#:%257E:text=the%2520command%2520uvicorn%2520main%253Aapp%2520refers%2520to%253A^0|1I|7|1T|6|9|5|0|0|2|G|0|0|4|7|7|G|7|0|0|3|5|7|K|F|0|0|8|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@$9|11|A|12|1|13]]|E|$]]|$1|F|3|G|5|6|7|14|8|@$9|15|A|16|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|17|8|@$9|18|A|19|B|C]|$9|1A|A|1B|B|C]|$9|1C|A|1D|B|C]]|D|@]|E|$]]|$1|K|3|L|5|J|7|1E|8|@$9|1F|A|1G|B|C]|$9|1H|A|1I|B|C]|$9|1J|A|1K|B|C]]|D|@]|E|$]]|$1|M|3|N|5|J|7|1L|8|@$9|1M|A|1N|B|C]]|D|@]|E|$]]|$1|O|3|-4|5|6|7|1O|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]]]

This worked for me <a href="https://fastapi.tiangolo.com/tutorial/first-steps/#:%7E:text=the%20command%20uvicorn%20main%3Aapp%20refers%20to%3A" rel="nofollow noreferrer">look at the docs</a> for fastAPI. I am very thankful I ran accross that as the Python script needs to be named <code>main.py</code> not <code>app.py</code>
The command <code>uvicorn main:app</code> refers to:
<ol>
<li><code>main</code>: the file <code>main.py</code> (the Python &quot;module&quot;).</li>
<li><code>app</code>: the object created inside of <code>main.py</code> with the line <code>app = FastAPI()</code></li>
<li><code>--reload</code>: make the server restart after code changes. Only use for
development.</li>
</ol>

blocks|key|675095|text|发生这种情况的原因之一是您正在使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|675096|uvicorn+src/main:app+--reload++++|code-block|syntax|javascript|675097|而不是正确的语法|offset|length|style|BOLD|675098|uvicorn+src.main:app+--reload+|675099|注意.而不是/|675100|目前自动完成终端提示格式错误.|675101|这是假设：|675102|(1)你的结构如下：|675103|project_folder/
├──+some_folder
├──+src
│+++└──+main.py
└──+tests
++++├──+test_xx.py
++++└──+test_yy.py|675104|(2)您的FastAPI()对象确实被分配给一个名为app的main.py对象|CODE|675105|app+=+FastAPI()|675106|(3)您正在从project_folder运行uvicorn命令，例如：|675107|(venv)+<username>@<pcname>:~/PycharmProjects/project_folder$+uvicorn+src.main:app+--reload|675108|entityMap^0|0|0|3|5|0|0|2|1|6|1|0|0|0|0|0|5|9|Q|3|U|7|0|0|7|E|0|0^^$0|@$1|2|3|4|5|6|7|19|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|1A|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|1B|8|@$I|1C|J|1D|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|1E|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|1F|8|@$I|1G|J|1H|K|L]|$I|1I|J|1J|K|L]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1K|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1L|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|1M|8|@]|9|@]|A|$]]|$1|W|3|X|5|D|7|1N|8|@]|9|@]|A|$E|F]]|$1|Y|3|Z|5|6|7|1O|8|@$I|1P|J|1Q|K|10]|$I|1R|J|1S|K|10]|$I|1T|J|1U|K|10]]|9|@]|A|$]]|$1|11|3|12|5|D|7|1V|8|@]|9|@]|A|$E|F]]|$1|13|3|14|5|6|7|1W|8|@$I|1X|J|1Y|K|10]]|9|@]|A|$]]|$1|15|3|16|5|D|7|1Z|8|@]|9|@]|A|$E|F]]|$1|17|3|-4|5|6|7|20|8|@]|9|@]|A|$]]]|18|$]]

One reason this might be happening is that you are using:
<pre><code>uvicorn src/main:app --reload 
</code></pre>
instead of the correct syntax:
<pre><code>uvicorn src.main:app --reload 
</code></pre>
Notice the . instead of the / 
Currently auto-completion in the terminal suggests the wrong format.
<hr />
That's assuming that:
(1) your structure is something like this:
<pre><code>project_folder/
├── some_folder
├── src
│ └── main.py
└── tests
 ├── test_xx.py
 └── test_yy.py
</code></pre>
(2) your <code>FastAPI()</code> object is indeed assigned to an object named <code>app</code> in <code>main.py</code>:
<pre><code>app = FastAPI()
</code></pre>
(3) you are running the uvicorn command from the <code>project_folder</code>, e.g.:
<pre><code>(venv) &lt;username&gt;@&lt;pcname&gt;:~/PycharmProjects/project_folder$ uvicorn src.main:app --reload
</code></pre>

blocks|key|675117|text|您将文件命名为main.py似乎很重要，否则它将无法工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|675118|编辑:实际上，我在8888端口上运行了木星笔记本，所以端口已经被占用了。如果你必须运行木星笔记本，运行它后，运行API服务器，笔记本电脑将自动运行8889。或者，您可以在另一个端口上运行API服务器。|675119|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

It seems it is important that you name your file main.py otherwise it won't work.
Edit: Actually I was running Jupyter Notebook on port 8888 so that port was already occupied. If you have to run Jupyter notebook, run it after running the API server, the notebook will automatically run on 8889.
Alternatively, you can run the API server on a different port.

blocks|key|675136|text|点击VS代码中的Save按钮等，因为如果您没有保存该文件，它有时会抛出此错误。发生在我身上。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|675137|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Hit the Save button in VS Code etc because sometimes it will throw this error if you have not saved the file. Happened to me.

blocks|key|99985|text|使用此文件夹结构和配置，其中main位于父目录中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|99986|📷|atomic|offset|length|99987|​|99988|launch.json|99989|{
++++//+Use+IntelliSense+to+learn+about+possible+attributes.
++++//+Hover+to+view+descriptions+of+existing+attributes.
++++//+For+more+information,+visit:+https://go.microsoft.com/fwlink/?linkid=830387
++++"version":+"0.2.0",
++++"configurations":+[
++++++++{
++++++++++++"name":+"Python:+FastAPI",
++++++++++++"type":+"python",
++++++++++++"request":+"launch",
++++++++++++"module":+"uvicorn",
++++++++++++"args":+[
++++++++++++++++"main:app"
++++++++++++],
++++++++++++"jinja":+true
++++++++}
++++]
}|code-block|syntax|javascript|99990|main.py|99991|from+fastapi+import+FastAPI
app+=+FastAPI(
++++title="test",
++++description="test",
++++version="0.0.1",
)
if+__name__+==+"__main__":
import+uvicorn

uvicorn.run(
++++"main:app",
++++host="0.0.0.0",
++++reload=True,
++++port=3001,
)|99992|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/7907fe4f152c84de38af0fdc1cb2dea9.png|imageAlt^0|0|0|1|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|13|8|@]|9|@$E|14|F|15|1|16]]|A|$]]|$1|G|3|H|5|6|7|17|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|18|8|@]|9|@]|A|$]]|$1|K|3|L|5|M|7|19|8|@]|9|@]|A|$N|O]]|$1|P|3|Q|5|6|7|1A|8|@]|9|@]|A|$]]|$1|R|3|S|5|M|7|1B|8|@]|9|@]|A|$N|O]]|$1|T|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]]|U|$V|$5|W|X|Y|A|$Z|10|11|-4]]]]

Use this folder structure and configuration where main is in parent directory
<a href="https://i.stack.imgur.com/3cc6Q.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/3cc6Q.png" alt="enter image description here" /></a>
launch.json
<pre><code>{
 // Use IntelliSense to learn about possible attributes.
 // Hover to view descriptions of existing attributes.
 // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
 &quot;version&quot;: &quot;0.2.0&quot;,
 &quot;configurations&quot;: [
 {
 &quot;name&quot;: &quot;Python: FastAPI&quot;,
 &quot;type&quot;: &quot;python&quot;,
 &quot;request&quot;: &quot;launch&quot;,
 &quot;module&quot;: &quot;uvicorn&quot;,
 &quot;args&quot;: [
 &quot;main:app&quot;
 ],
 &quot;jinja&quot;: true
 }
 ]
}
</code></pre>
main.py
<pre><code>from fastapi import FastAPI
app = FastAPI(
 title=&quot;test&quot;,
 description=&quot;test&quot;,
 version=&quot;0.0.1&quot;,
)
if __name__ == &quot;__main__&quot;:
import uvicorn

uvicorn.run(
 &quot;main:app&quot;,
 host=&quot;0.0.0.0&quot;,
 reload=True,
 port=3001,
)
</code></pre>

blocks|key|675208|text|造成此错误的另一个原因是:文件之间有一个循环引用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|675209|示例：|675210|main.py：
从工具导入验证器#。类GlobalException(异常)：#.|unordered-list-item|offset|length|style|CODE|675211|/tools/validator.py：
从主要进口GlobalException|675212|entityMap^0|0|0|0|7|0|0|J|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@$G|R|H|S|I|J]]|9|@]|A|$]]|$1|K|3|L|5|F|7|T|8|@$G|U|H|V|I|J]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|N|$]]

Another reason for this error: there is a circular reference between files.
Example:
<ul>
<li><code>main.py</code>:
<pre class="lang-py prettyprint-override"><code>from tools import validator

# ...

class GlobalException(Exception):
 # ...
</code></pre>
</li>
<li><code>/tools/validator.py</code>:
<pre class="lang-py prettyprint-override"><code>from main import GlobalException
</code></pre>
</li>
</ul>

blocks|key|100022|text|造成此错误的另一个原因是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|100023|已经有一个文件名与您正在运行的文件夹完全相同，然后它将与系统产生冲突。|100024|例如，在名为test_app/main.py的文件夹中有一个文件，然后运行uvicorn+test_app.main:app+--reload来运行应用程序。|offset|length|style|CODE|100025|但是，如果您有一个名为test_app.py的文件(与上面的文件夹同名)，它将在运行该应用程序时抛出错误。|100026|​|100027|📷|atomic|100028|100029|因此，解决方案是重命名文件夹或重命名文件，这样它们就不会相互冲突。|100030|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/ad75dab7b3e86d9bdac400e65c2eed7e.png|imageAlt^0|0|0|6|G|11|Y|0|B|B|0|0|0|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|13|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|14|8|@$F|15|G|16|H|I]|$F|17|G|18|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|19|8|@$F|1A|G|1B|H|I]]|9|@]|A|$]]|$1|L|3|M|5|6|7|1C|8|@]|9|@]|A|$]]|$1|N|3|O|5|P|7|1D|8|@]|9|@$F|1E|G|1F|1|1G]]|A|$]]|$1|Q|3|M|5|6|7|1H|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|1I|8|@]|9|@]|A|$]]|$1|T|3|-4|5|6|7|1J|8|@]|9|@]|A|$]]]|U|$V|$5|W|X|Y|A|$Z|10|11|-4]]]]

Also another reason for this error:
There's already a file named exactly like your running folder, then it will make a conflict to the system.
Example you have a file inside a folder named <code>test_app/main.py</code>, then you should run <code>uvicorn test_app.main:app --reload</code> to run the app.
But, if you have a file named <code>test_app.py</code> (which is the same name as the folder above), it will throw the error when you run the app.
<a href="https://i.stack.imgur.com/5arhM.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5arhM.png" alt="enter image description here" /></a>
So the solution is to rename the folder or rename the file so they won't be conflict to each other.

blocks|key|101020|text|步骤-1确保主文件位于终端/命令提示符的同一个目录中，使用ls命令|type|unordered-list-item|depth|inlineStyleRanges|offset|length|style|BOLD|CODE|entityRanges|data|101021|(virtual-env)+shayon@shayon-X556UQK:~/Documents/python-fast-api$+ls
main.py++__pycache__++README.md++requirements.txt++virtual-env|code-block|syntax|javascript|101022|步骤2使用pwd命令检查终端的目录|101023|(virtual-env)+shayon@shayon-X556UQK:~/Documents/python-fast-api$+pwd
/home/shayon/Documents/python-fast-api|101024|Step-3检查对象的名称这里app是FastAPI的对象，所以我们需要使用uvicorn+main:app+--reload命令，如果您保留对象名app1，则需要运行uvicorn+main:app1+--reload。|101025|(virtual-env)+shayon@shayon-X556UQK:~/Documents/python-fast-api$+cat+main.py|101026|main.py|unstyled|101027|from+fastapi+import+FastAPI
app+=+FastAPI()


@app.get("/")
def+index():
++++return+{"Hello":+"World"}|101028|Step-4在我的例子中，我在指挥uvicorn+main.py:app+--reload时犯了一个错误，这就是我出错的原因。命令应该是uvicorn+main:app+--reload+(没有点py扩展)|101029|希望这个帮助--享受:)|101030|entityMap^0|0|4|T|2|0|0|0|3|5|3|0|0|0|6|F|3|12|P|22|4|2C|Q|0|0|0|7|0|0|0|6|H|S|1W|P|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@$9|15|A|16|B|C]|$9|17|A|18|B|D]]|E|@]|F|$]]|$1|G|3|H|5|I|7|19|8|@]|E|@]|F|$J|K]]|$1|L|3|M|5|6|7|1A|8|@$9|1B|A|1C|B|C]|$9|1D|A|1E|B|D]]|E|@]|F|$]]|$1|N|3|O|5|I|7|1F|8|@]|E|@]|F|$J|K]]|$1|P|3|Q|5|6|7|1G|8|@$9|1H|A|1I|B|C]|$9|1J|A|1K|B|D]|$9|1L|A|1M|B|D]|$9|1N|A|1O|B|D]|$9|1P|A|1Q|B|D]]|E|@]|F|$]]|$1|R|3|S|5|I|7|1R|8|@]|E|@]|F|$J|K]]|$1|T|3|U|5|V|7|1S|8|@$9|1T|A|1U|B|C]]|E|@]|F|$]]|$1|W|3|X|5|I|7|1V|8|@]|E|@]|F|$J|K]]|$1|Y|3|Z|5|6|7|1W|8|@$9|1X|A|1Y|B|C]|$9|1Z|A|20|B|D]|$9|21|A|22|B|D]]|E|@]|F|$]]|$1|10|3|11|5|V|7|23|8|@]|E|@]|F|$]]|$1|12|3|-4|5|V|7|24|8|@]|E|@]|F|$]]]|13|$]]

<ul>
<li>Step-1 make sure your main file is located in the same directory of your terminal/command prompt, use <code>ls</code> command</li>
</ul>
<pre><code>(virtual-env) shayon@shayon-X556UQK:~/Documents/python-fast-api$ ls
main.py __pycache__ README.md requirements.txt virtual-env
</code></pre>
<ul>
<li>Step-2 check the directory of your terminal using <code>pwd</code> command</li>
</ul>
<pre><code>(virtual-env) shayon@shayon-X556UQK:~/Documents/python-fast-api$ pwd
/home/shayon/Documents/python-fast-api
</code></pre>
<ul>
<li>Step-3 check the name of your object - here <code>app</code> is the object of FastAPI so we need to use the command <code>uvicorn main:app --reload</code>, if you keep the object name <code>app1</code> you need to run <code>uvicorn main:app1 --reload</code></li>
</ul>
<pre><code>(virtual-env) shayon@shayon-X556UQK:~/Documents/python-fast-api$ cat main.py
</code></pre>
main.py
<pre><code>from fastapi import FastAPI
app = FastAPI()


@app.get(&quot;/&quot;)
def index():
 return {&quot;Hello&quot;: &quot;World&quot;}
</code></pre>
<ul>
<li>Step-4 In my case, I made a mistake making command of <code>uvicorn main.py:app --reload</code> and this was the reason for my error. The command should be <code>uvicorn main:app --reload</code> (without dot py extension)</li>
</ul>
<h1>Hope this help - Enjoy :)</h1>

blocks|key|675320|text|如果使用Pycharm，原因可能是源目录设置不正确。例如，我试图使用docker-组合配置Python远程调试器，我的文件夹结构如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|675321|my_app_name
├──+docker-compose.yml
├──+src
│+++└──+main.py
└──+tests
++++├──+test_file1.py
++++└──+test_file2.py|code-block|syntax|javascript|675322|根文件夹中有src文件夹，其中包含main.py文件。在PyCharm项目设置中，默认情况下，您的源文件夹被设置为root.But，如果您有像上面这样的嵌套结构，您必须转到首选项->+project+->Project>Sources，然后将您的src文件夹添加到source文件夹下。|offset|length|style|BOLD|675323|entityMap^0|0|0|2E|V|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

If you are using Pycharm , the reason could be the source directory not being set correctly. For example, I was trying to configure Python remote debugger using docker-compose and my folder structure was like this:
<pre><code>my_app_name
├── docker-compose.yml
├── src
│ └── main.py
└── tests
 ├── test_file1.py
 └── test_file2.py
</code></pre>
I had the src folder inside the root folder, which contained the main.py file. In PyCharm project settings, by default your source folder is set to root.But if you have a nested structure like the case above, you have to go to Preferences-&gt;Project-&gt;Project Structure-&gt;Sources and add your src folder under Source Folders.

blocks|key|2058338|text|对我来说，这是一个空间问题，我不得不删除一些文件和文件夹在我的系统。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2058339|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

For me it was a space problem, I had to delete some files and folders in my system.

blocks|key|675345|text|我也遇到了同样的问题，作为FastAPI的完全初学者，Yagiz给出的解决方案帮助我为像我这样的初学者提供了一个简单的想法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|675346|cd+directory+of+code
uvicorn+fast-api:main+--reload+|code-block|syntax|javascript|675347|PS。快速api是我的文件名(即快速api.py)|675348|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I also encountered the same issue,
being a total beginner to FastAPI, the solution given by Yagiz Degirmenci
helped to come up with a simple idea for beginners like me, i.e
<pre><code>cd directory of code
uvicorn fast-api:main --reload 
</code></pre>
PS. fast-api is the name of my file (i.e fast-api.py)

blocks|key|675386|text|我通过在我的主目录中使用以下内容来修正这个问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|675387|import+uvicorn

app+=+FastAPI()

@app.get("/")
def+index():
++++return+{"index":+"root"}

if+__name__+==+'__main__':

++++uvicorn.run(f"{Path(__file__).stem}:app",+host="127.0.0.1",+port=8888,+reload=True)|code-block|syntax|javascript|675388|然后在终端中键入uvicorn+main:app+--reload，因为我的main.py位于根文件夹中。|offset|length|style|CODE|675389|entityMap^0|0|0|8|P|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I fixed this by using the following in my main:
<pre><code>import uvicorn

app = FastAPI()

@app.get(&quot;/&quot;)
def index():
 return {&quot;index&quot;: &quot;root&quot;}

if __name__ == '__main__':

 uvicorn.run(f&quot;{Path(__file__).stem}:app&quot;, host=&quot;127.0.0.1&quot;, port=8888, reload=True)
</code></pre>
and then from the terminal, I typed <code>uvicorn main:app --reload </code> as my main.py is in my root folder.

blocks|key|2058417|text|不要为您的python文件指定相同的名称，如uvicorn.py、文件夹同名、包名|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2058418|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

don't give the same name for your python file like uvicorn.py,Folder same name, package name

I tried to run FastAPI using uvicorn webserver but it throws an error.
I run this command,
<pre><code>uvicorn api:app --reload --host 0.0.0.0
</code></pre>
but there is an error in the terminal.
<pre><code>Uvicorn running on http://0.0.0.0:8000 (Press CTRL+C to quit)
Started reloader process [23445]
Error loading ASGI app. Could not import module &quot;api&quot;.
Stopping reloader process [23445]
</code></pre>

FastAPI throws an error (Error loading ASGI app. Could not import module "api")

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我试图使用运行FastAPI，但它引发了一个错误。我执行这个命令，uvicorn api:app --reload --host 0.0.0.0但是终端有个错误。Uvicorn running on http://0.0.0.0:8000 (Press CTRL+C to quit)Started reloader p...

问FastAPI抛出一个错误(加载ASGI应用程序时出错)。无法导入模块"api")
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问FastAPI抛出一个错误(加载ASGI应用程序时出错)。无法导入模块"api")EN