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python - Flask 错误 werkzeug 路由故障排除

问题描述

我正在按照教程做最简单的“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 驱动器的根目录创建了目录，以避免潜在的路径问题。我正在运行 Python 3.8 和 Flask 1.0.2 和 werkzeug 0.15.2

在发出烧瓶命令之前，我正在做两件事。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，顶级脚本运行（内容here）

from app import app

它调用__init__.py app 文件夹中的文件，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，请确保您正确设置了 PATH 变量。就我而言，我安装了一个 Anaconda 和一个具有冲突版本的常规 Python 安装。最后，应用程序通过 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 变量中

烧瓶快乐:)！

标签： pythonpython-3.xflaskwerkzeug

解决方案

看起来flask（werkzeug模块）与python3.8 github问题不兼容如果您使用werkzeug <0.15.5，请考虑降级到python 3.7（并将python3链接从虚拟环境指向python3.7）或升级您的werkzeug模块到 0.15.5 或更高。

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