Not able to run FastAPI server, ValueError: source code string cannot contain null bytes

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英文:

Not able to run FastAPI server, ValueError: source code string cannot contain null bytes

问题

学习FastAPI时，每当我尝试运行它时都会出现错误。

错误：

  1. PS C:\Users\obunga\OneDrive\Desktop\py\fastfast> uvicorn main:app --reload
  2. INFO:     将监视这些目录中的更改: ['C:\\Users\\obunga\\OneDrive\\Desktop\\py\\fastfast']
  3. INFO:     Uvicorn运行在http://127.0.0.1:8000（按CTRL+C退出）
  4. INFO:     启动重载器进程[5464]，使用WatchFiles
  5. Process SpawnProcess-1:
  6. Traceback（最近一次调用最近）：
  7.   File "C:\Users\obunga\AppData\Local\Programs\Python\Python311\Lib\multiprocessing\process.py"，第314行，_bootstrap
  8.     self.run()
  9.   File "C:\Users\obunga\AppData\Local\Programs\Python\Python311\Lib\multiprocessing\process.py"，第108行，run
  10.     self._target(*self._args，**self._kwargs)
  11.   File "C:\Users\obunga\AppData\Local\Programs\Python\Python311\Lib\site-packages\uvicorn\_subprocess.py"，第76行，subprocess_started
  12.     target(sockets=sockets)
  13.   File "C:\Users\obunga\AppData\Local\Programs\Python\Python311\Lib\site-packages\uvicorn\server.py"，第60行，run
  14.     return asyncio.run(self.serve(sockets=sockets))
  15.            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  16.   File "C:\Users\obunga\AppData\Local\Programs\Python\Python311\Lib\asyncio\runners.py"，第190行，run
  17.     return runner.run(main)
  18.            ^^^^^^^^^^^^^^^^
  19.   File "C:\Users\obunga\AppData\Local\Programs\Python\Python311\Lib\asyncio\runners.py"，第118行，run
  20.     return self._loop.run_until_complete(task)
  21.            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  22.   File "C:\Users\obunga\AppData\Local\Programs\Python\Python311\Lib\asyncio\base_events.py"，第653行，run_until_complete
  23.     return future.result()
  24.            ^^^^^^^^^^^^^^^
  25.   File "C:\Users\obunga\AppData\Local\Programs\Python\Python311\Lib\site-packages\uvicorn\server.py"，第67行，serve
  26.     config.load()
  27.   File "C:\Users\obunga\AppData\Local\Programs\Python\Python311\Lib\site-packages\uvicorn\config.py"，第477行，load
  28.     self.loaded_app = import_from_string(self.app)
  29.                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  30.   File "C:\Users\obunga\AppData\Local\Programs\Python\Python311\Lib\site-packages\uvicorn\importer.py"，第21行，import_from_string
  31.     module = importlib.import_module(module_str)
  32.              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  33.   File "C:\Users\obunga\AppData\Local\Programs\Python\Python311\Lib\importlib\__init__.py"，第126行，import_module
  34.     return _bootstrap._gcd_import(name[level:]，package，level)
  35.            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  36.   File "<frozen importlib._bootstrap>"，第1206行，_gcd_import
  37.   File "<frozen importlib._bootstrap>"，第1178行，_find_and_load
  38.   File "<frozen importlib._bootstrap>"，第1149行，_find_and_load_unlocked
  39.   File "<frozen importlib._bootstrap>"，第690行，_load_unlocked
  40.   File "<frozen importlib._bootstrap_external>"，第936行，exec_module
  41.   File "<frozen importlib._bootstrap_external>"，第1074行，get_code
  42.   File "<frozen importlib._bootstrap_external>"，第1004行，source_to_code
  43.   File "<frozen importlib._bootstrap>"，第241行，_call_with_frames_removed
  44. ValueError: 源代码字符串不能包含空字节

我已经尝试重新安装Python、FastAPI和Uvicorn，但错误仍然存在。我的Python版本是3.11.2。

代码非常基本：main.py -

  1. from fastapi import FastAPI
  3. app = FastAPI()
  5. @app.get("/")
  6. def index():
  7.     return {"lyrics": "heyyyyyyyyy"}

http://127.0.0.1:8000 无法访问。

问题是什么，如何修复？

英文:

Learning FastAPI, however, an error occurs whenever I'm trying to run it.

Error:

  1. PS C:\Users\obunga\OneDrive\Desktop\py\fastfast> uvicorn main:app --reload
  2. INFO:     Will watch for changes in these directories: ['C:\\Users\\obunga\\OneDrive\\Desktop\\py\\fastfast']
  3. INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
  4. INFO:     Started reloader process [5464] using WatchFiles
  5. Process SpawnProcess-1:
  6. Traceback (most recent call last):
  7.   File "C:\Users\obunga\AppData\Local\Programs\Python\Python311\Lib\multiprocessing\process.py", line 314, in _bootstrap
  8.     self.run()
  9.   File "C:\Users\obunga\AppData\Local\Programs\Python\Python311\Lib\multiprocessing\process.py", line 108, in run
  10.     self._target(*self._args, **self._kwargs)
  11.   File "C:\Users\obunga\AppData\Local\Programs\Python\Python311\Lib\site-packages\uvicorn\_subprocess.py", line 76, in subprocess_started
  12.     target(sockets=sockets)
  13.   File "C:\Users\obunga\AppData\Local\Programs\Python\Python311\Lib\site-packages\uvicorn\server.py", line 60, in run
  14.     return asyncio.run(self.serve(sockets=sockets))
  15.            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  16.   File "C:\Users\obunga\AppData\Local\Programs\Python\Python311\Lib\asyncio\runners.py", line 190, in run
  17.     return runner.run(main)
  18.            ^^^^^^^^^^^^^^^^
  19.   File "C:\Users\obunga\AppData\Local\Programs\Python\Python311\Lib\asyncio\runners.py", line 118, in run
  20.     return self._loop.run_until_complete(task)
  21.            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  22.   File "C:\Users\obunga\AppData\Local\Programs\Python\Python311\Lib\asyncio\base_events.py", line 653, in run_until_complete
  23.     return future.result()
  24.            ^^^^^^^^^^^^^^^
  25.   File "C:\Users\obunga\AppData\Local\Programs\Python\Python311\Lib\site-packages\uvicorn\server.py", line 67, in serve
  26.     config.load()
  27.   File "C:\Users\obunga\AppData\Local\Programs\Python\Python311\Lib\site-packages\uvicorn\config.py", line 477, in load
  28.     self.loaded_app = import_from_string(self.app)
  29.                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  30.   File "C:\Users\obunga\AppData\Local\Programs\Python\Python311\Lib\site-packages\uvicorn\importer.py", line 21, in import_from_string
  31.     module = importlib.import_module(module_str)
  32.              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  33.   File "C:\Users\obunga\AppData\Local\Programs\Python\Python311\Lib\importlib\__init__.py", line 126, in import_module
  34.     return _bootstrap._gcd_import(name[level:], package, level)
  35.            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  36.   File "<frozen importlib._bootstrap>", line 1206, in _gcd_import
  37.   File "<frozen importlib._bootstrap>", line 1178, in _find_and_load
  38.   File "<frozen importlib._bootstrap>", line 1149, in _find_and_load_unlocked
  39.   File "<frozen importlib._bootstrap>", line 690, in _load_unlocked
  40.   File "<frozen importlib._bootstrap_external>", line 936, in exec_module
  41.   File "<frozen importlib._bootstrap_external>", line 1074, in get_code
  42.   File "<frozen importlib._bootstrap_external>", line 1004, in source_to_code
  43.   File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  44. ValueError: source code string cannot contain null bytes

I've tried re-installing Python, FastAPI and Uvicorn, but the error remains. My python version: 3.11.2

The code is pretty basic one: main.py -

  1. from fastapi import FastAPI
  3. app = FastAPI()
  6. @app.get("/")
  7. def index():
  8.     return {"lyrics": "heyyyyyyyyy"}

http://127.0.0.1:8000 is unreachable.

What is the issue and how to fix it?

答案1

得分: 2

  1. 将 main.py 文件格式设置为 UTF-8。
  2. 将位于 C:\Users\USERNAME\AppData\Local\Programs\Python\Python311\Lib\importlib 下的文件格式设置为 UTF-8。
    你可以使用 VSCODE（右下角->保存为编码） 或 Notepad++（编码->转换为UTF-8） 来将文件格式设置为 UTF-8。
英文:

After surfing the web for the solution for hours, one/both of these solutions worked. I found that this issue occurs when doing Django or PHP stuff too.

  1. Formatting the main.py file to UTF-8
  2. Formatting the files under C:\Users\USERNAME\AppData\Local\Programs\Python\Python311\Lib\importlib to UTF-8.

You can format the files to UTF-8 using VSCODE (bottom right corner->save as encoding) or Notepad++(encoding->convert to UTF-8)

huangapple
  • 本文由 发表于 2023年3月9日 20:38:42
  • 转载请务必保留本文链接：https://go.coder-hub.com/75684738.html
  • fastapi
  • python
  • python-3.x
  • webserver
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