python - Flask 错误 werkzeug 路由故障排除

Question

我正在按照教程制作最简单的“Hello World”Flask 应用程序，如下所述: https://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-i-hello-world

为了上下文，我在 C 驱动器的根目录下创建了目录，以避免潜在的路径问题。我正在运行 Python 3.8、Flask 1.0.2 和 werkzeug 0.15.2

在发出 Flask 命令之前，我做了两件事。创建虚拟环境并安装本地flask版本

$ python -m venv venv
$ venv\Scripts\activate
(venv) $ pip install flask

并设置 FLASK_APP 环境变量

(venv) $ set FLASK_APP=microblog.py

当我发出“flask run”命令时，会运行顶级脚本(此处的内容)

from app import app

它调用应用程序文件夹中的 __init__.py 文件，其中包含:

from flask import Flask

app = Flask(__name__) #The name "app" is being passed

from app import routes

第二行失败并显示以下错误输出:

Traceback (most recent call last):
  File "C:\Python38\lib\runpy.py", line 192, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "C:\Python38\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\microblog\venv\Scripts\flask.exe\__main__.py", line 9, in <module>
  File "c:\microblog\venv\lib\site-packages\flask\cli.py", line 894, in main
    cli.main(args=args, prog_name=name)
  File "c:\microblog\venv\lib\site-packages\flask\cli.py", line 557, in main
    return super(FlaskGroup, self).main(*args, **kwargs)
  File "c:\microblog\venv\lib\site-packages\click\core.py", line 717, in main
    rv = self.invoke(ctx)
  File "c:\microblog\venv\lib\site-packages\click\core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "c:\microblog\venv\lib\site-packages\click\core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "c:\microblog\venv\lib\site-packages\click\core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "c:\microblog\venv\lib\site-packages\click\decorators.py", line 64, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
  File "c:\microblog\venv\lib\site-packages\click\core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "c:\microblog\venv\lib\site-packages\flask\cli.py", line 767, in run_command
    app = DispatchingApp(info.load_app, use_eager_loading=eager_loading)
  File "c:\microblog\venv\lib\site-packages\flask\cli.py", line 293, in __init__
    self._load_unlocked()
  File "c:\microblog\venv\lib\site-packages\flask\cli.py", line 317, in _load_unlocked
    self._app = rv = self.loader()
  File "c:\microblog\venv\lib\site-packages\flask\cli.py", line 372, in load_app
    app = locate_app(self, import_name, name)
  File "c:\microblog\venv\lib\site-packages\flask\cli.py", line 235, in locate_app
    __import__(module_name)
  File "c:\microblog\microblog.py", line 1, in <module>
    from app import app
  File "c:\microblog\app\__init__.py", line 5, in <module>
    app = Flask(__name__) #The name "app" is being passed
  File "c:\microblog\venv\lib\site-packages\flask\app.py", line 558, in __init__
    self.add_url_rule(
  File "c:\microblog\venv\lib\site-packages\flask\app.py", line 66, in wrapper_func
    return f(self, *args, **kwargs)
  File "c:\microblog\venv\lib\site-packages\flask\app.py", line 1216, in add_url_rule
    self.url_map.add(rule)
  File "c:\microblog\venv\lib\site-packages\werkzeug\routing.py", line 1562, in add
    rule.bind(self)
  File "c:\microblog\venv\lib\site-packages\werkzeug\routing.py", line 711, in bind
    self.compile()
  File "c:\microblog\venv\lib\site-packages\werkzeug\routing.py", line 767, in compile
    self._build = self._compile_builder(False)
  File "c:\microblog\venv\lib\site-packages\werkzeug\routing.py", line 1128, in _compile_builder
    return self.BuilderCompiler(self).compile(append_unknown)
  File "c:\microblog\venv\lib\site-packages\werkzeug\routing.py", line 1119, in compile
    co = types.CodeType(*code_args)
TypeError: code() takes at least 14 arguments (13 given)

除了下面的答案之外，请确保您的 PATH 变量设置正确。就我而言，我安装了 Anaconda 和常规 Python 安装，但两者存在版本冲突。最终，应用程序通过了Anaconda Prompt运行。要解决此类问题，请尝试将 bash_profile 中的 Anaconda 路径添加到 Windows 中的 PATH 变量

开瓶快乐:)!

Answer 1

看起来flask(werkzeug模块)与python3.8不兼容github issue如果您使用 werkzeug <0.15.5，请考虑降级到 python 3.7(并将虚拟环境中的 python3 链接指向 python3.7)或将 werkzeug 模块升级到 0.15.5 或更高版本。