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python-3.x - 在 Hello World 烧瓶应用程序中，Flask 找不到该应用程序

问题描述

我正在运行 Flask 文档中的最小 Hello World 应用程序。代码如下。我得到no module named "flask.hello."回溯也在下面。我想知道如何引导烧瓶来解析应用程序的位置。源文件的名称是 hello.py。我设置

FLASK_APP='hello.py' and PYTHONPATH="."

我使用以下命令启动 Flask：

flask run --host=0.0.0.0 --port=3000


from flask import Flask
app=Flask(__name__)

@app.route('/')
def hello_world():
    return 'Hello world!"

Traceback (most recent call last):
  File "/home/anna_user2/.venv/projects/web-plots/lib/python3.7/site-packages/flask/cli.py", line 240, in locate_app
    __import__(module_name)
ModuleNotFoundError: No module named 'flask.hello'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/anna_user2/.venv/projects/web-plots/lib/python3.7/site-packages/flask/cli.py", line 338, in __call__
    self._flush_bg_loading_exception()
  File "/home/anna_user2/.venv/projects/web-plots/lib/python3.7/site-packages/flask/cli.py", line 326, in _flush_bg_loading_exception
    reraise(*exc_info)
  File "/home/anna_user2/.venv/projects/web-plots/lib/python3.7/site-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/home/anna_user2/.venv/projects/web-plots/lib/python3.7/site-packages/flask/cli.py", line 314, in _load_app
    self._load_unlocked()
  File "/home/anna_user2/.venv/projects/web-plots/lib/python3.7/site-packages/flask/cli.py", line 330, in _load_unlocked
    self._app = rv = self.loader()
  File "/home/anna_user2/.venv/projects/web-plots/lib/python3.7/site-packages/flask/cli.py", line 388, in load_app
    app = locate_app(self, import_name, name)
  File "/home/anna_user2/.venv/projects/web-plots/lib/python3.7/site-packages/flask/cli.py", line 250, in locate_app
    raise NoAppException('Could not import "{name}".'.format(name=module_name))
flask.cli.NoAppException: Could not import "flask.hello".

标签： python-3.xflask

解决方案

我的工作目录被称为“flask”，显然混淆了flask。当我将其重命名为 flask_dir 时，一切正常。

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