Question

我是python和flask框架的新手，这看似微不足道，但我陷入了僵局。当我尝试运行Flask应用程序时，出现错误 keyError：'default'。

这是我的代码，分别放在三个不同的 .py 模块

manage.py

import os

from flask_script import Manager, Shell
from flask_migrate import Migrate, MigrateCommand
from app.models import User, Role
from app import create_app, db

app = create_app(os.getenv('FLASK_CONFIG') or 'default')

manager = Manager(app)
migrate = Migrate(app, db)


@app.shell_context_processor
def make_shell_context():
    return dict(db=db, User=User, Role=Role)

manager.add_command('shell', Shell(make_context=make_shell_context))
manager.add_command('db', MigrateCommand)




if __name__ == '__main__':
    manager.run()

config.py

import os 

basedir = os.path.abspath(os.path.dirname(__file__))

class Config:
    SECRET_KEY = 'SECRET_KEY' or 'hard to guess string'
    SQLALCHEMY_COMMIT_ON_TEARDOWN = True
    FLASKY_MAIL_SUBJECT_PREFIX = '[Flasky]'
    FLASKY_MAIL_SENDER = 'Flasky Admin <flasky@example.com>'
    FLASKY_ADMIN = os.environ.get('FLASKY_ADMIN')
    MAIL_SERVER = 'smtp.googlemail.com'
    MAIL_PORT = 587
    MAIL_USE_TLS = True
    MAIL_USERNAME = os.environ.get('MAIL_USERNAME')
    MAIL_PASSWORD = os.environ.get('MAIL_PASSWORD')
    SQLALCHEMY_TRACK_MODIFICATIONS = False

    @staticmethod
    def init_app(app):
        pass


class DevelopmentConfig(Config):
    DEBUG = True

    SQLALCHEMY_DATABASE_URI = os.environ.get('DEV_DATABASE_URL') or \
        'sqlite:///' + os.path.join(basedir, 'data-dev.sqlite')



class ProductionConfig(Config):
    SQLALCHEMY_DATABASE_URI = os.environ.get('DATABASE_URL') or \
        'sqlite:///' + os.path.join(basedir, 'data.sqlite')

config = {
    'development': DevelopmentConfig,
    'production': ProductionConfig,

    'default': DevelopmentConfig
}

app / __ init __。py


from flask import Flask
from flask_bootstrap import Bootstrap
from flask_mail import Mail, Message
from flask_moment import Moment
from flask_sqlalchemy import SQLAlchemy

from config import config


bootstrap = Bootstrap()
mail = Mail()
moment = Moment()
db = SQLAlchemy()


def create_app(config_name):
    app = Flask(__name__)
    app.config.from_object(config[config_name])
    app.config[config_name].init_app(app)

    bootstrap.init_app(app)
    mail.init_app(app)
    moment.init_app(app)
    db.init_app(app)

    from .main import main as main_blueprint
    app.register_blueprint(main_blueprint)

    return app

这是正在获取的追溯信息

Traceback (most recent call last):
  File "/home/charlson/Vscode/flasky/venv/bin/flask", line 11, in <module>
    sys.exit(main())
  File "/home/charlson/Vscode/flasky/venv/lib/python3.6/site-packages/flask/cli.py", line 513, in main
    cli.main(args=args, prog_name=name)
  File "/home/charlson/Vscode/flasky/venv/lib/python3.6/site-packages/flask/cli.py", line 380, in main
    return AppGroup.main(self, *args, **kwargs)
  File "/home/charlson/Vscode/flasky/venv/lib/python3.6/site-packages/click/core.py", line 697, in main
    rv = self.invoke(ctx)
  File "/home/charlson/Vscode/flasky/venv/lib/python3.6/site-packages/click/core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/charlson/Vscode/flasky/venv/lib/python3.6/site-packages/click/core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/charlson/Vscode/flasky/venv/lib/python3.6/site-packages/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/home/charlson/Vscode/flasky/venv/lib/python3.6/site-packages/click/decorators.py", line 64, in new_func
    return ctx.invoke(f, obj, *args[1:], **kwargs)
  File "/home/charlson/Vscode/flasky/venv/lib/python3.6/site-packages/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/home/charlson/Vscode/flasky/venv/lib/python3.6/site-packages/flask/cli.py", line 423, in run_command
    app = DispatchingApp(info.load_app, use_eager_loading=eager_loading)
  File "/home/charlson/Vscode/flasky/venv/lib/python3.6/site-packages/flask/cli.py", line 152, in __init__
    self._load_unlocked()
  File "/home/charlson/Vscode/flasky/venv/lib/python3.6/site-packages/flask/cli.py", line 176, in _load_unlocked
    self._app = rv = self.loader()
  File "/home/charlson/Vscode/flasky/venv/lib/python3.6/site-packages/flask/cli.py", line 237, in load_app
    rv = locate_app(self.app_import_path)
  File "/home/charlson/Vscode/flasky/venv/lib/python3.6/site-packages/flask/cli.py", line 90, in locate_app
    __import__(module)
  File "/home/charlson/Vscode/flasky/flasky.py", line 8, in <module>
    app = create_app(os.getenv('FLASK_CONFIG') or 'default')
  File "/home/charlson/Vscode/flasky/app/__init__.py", line 19, in create_app
    app.config[config_name].init_app(app)
KeyError: 'default'

期望在本地计算机上的端口http://localhost:5000上有一个简单的网页

任何帮助都会令人感激

Answer 1

在加载配置即app.config[config_name].init_app(app)后删除代码app.config.from_object(config[config_name])

您已成功将conf数据加载到应用程序，然后可以访问在config类中指定的配置值。就像访问普通字典一样，因此它没有像default这样的任何属性会导致错误。

在删除代码app.config[config_name].init_app(app)后尝试运行应用程序，它将正常工作。

请参阅此page以获取更多信息

KeyError：“默认”。这是我尝试运行应用程序时遇到的错误

1 个答案: