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python - 导入错误：来自 . import postgresql, mysql, sqlite, mssql, oracle # pragma: no cover ImportError: cannot import name 'mysql'

问题描述

我正在尝试在我的网络上使用烧瓶应用程序。

我已经安装了 Flask、Flask-Session、psycopg2-binary 和 SQLAlchemy

之后，我尝试了烧瓶中的一个简单代码

from flask import Flask
app = Flask(__name__)

@app.route('/')
def hello_world():
    return 'Hello, World!'

预期的输出是打开我的烧瓶应用程序的链接，但是在我的终端上执行“烧瓶运行”之后，我收到了这个错误

Traceback (most recent call last):
  File "/home/xenoveals/.local/bin/flask", line 11, in <module>
    sys.exit(main())
  File "/home/xenoveals/.local/lib/python3.6/site-packages/flask/cli.py", line 967, in main
    cli.main(args=sys.argv[1:], prog_name="python -m flask" if as_module else None)
  File "/home/xenoveals/.local/lib/python3.6/site-packages/flask/cli.py", line 586, in main
    return super(FlaskGroup, self).main(*args, **kwargs)
  File "/home/xenoveals/.local/lib/python3.6/site-packages/click/core.py", line 781, in main
    with self.make_context(prog_name, args, **extra) as ctx:
  File "/home/xenoveals/.local/lib/python3.6/site-packages/click/core.py", line 700, in make_context
    self.parse_args(ctx, args)
  File "/home/xenoveals/.local/lib/python3.6/site-packages/click/core.py", line 1209, in parse_args
    echo(ctx.get_help(), color=ctx.color)
  File "/home/xenoveals/.local/lib/python3.6/site-packages/click/core.py", line 570, in get_help
    return self.command.get_help(self)
  File "/home/xenoveals/.local/lib/python3.6/site-packages/click/core.py", line 975, in get_help
    self.format_help(ctx, formatter)
  File "/home/xenoveals/.local/lib/python3.6/site-packages/click/core.py", line 1003, in format_help
    self.format_options(ctx, formatter)
  File "/home/xenoveals/.local/lib/python3.6/site-packages/click/core.py", line 1137, in format_options
    self.format_commands(ctx, formatter)
  File "/home/xenoveals/.local/lib/python3.6/site-packages/click/core.py", line 1184, in format_commands
    for subcommand in self.list_commands(ctx):
  File "/home/xenoveals/.local/lib/python3.6/site-packages/flask/cli.py", line 549, in list_commands
    self._load_plugin_commands()
  File "/home/xenoveals/.local/lib/python3.6/site-packages/flask/cli.py", line 523, in _load_plugin_commands
    self.add_command(ep.load(), ep.name)
  File "/home/xenoveals/.local/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2446, in load
    return self.resolve()
  File "/home/xenoveals/.local/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2452, in resolve
    module = __import__(self.module_name, fromlist=['__name__'], level=0)
  File "/usr/lib/python3/dist-packages/flask_migrate/__init__.py", line 8, in <module>
    from alembic import __version__ as __alembic_version__
  File "/usr/lib/python3/dist-packages/alembic/__init__.py", line 9, in <module>
    from . import context  # noqa
  File "/usr/lib/python3/dist-packages/alembic/context.py", line 1, in <module>
    from .runtime.environment import EnvironmentContext
  File "/usr/lib/python3/dist-packages/alembic/runtime/environment.py", line 2, in <module>
    from .migration import MigrationContext
  File "/usr/lib/python3/dist-packages/alembic/runtime/migration.py", line 12, in <module>
    from .. import ddl, util
  File "/usr/lib/python3/dist-packages/alembic/ddl/__init__.py", line 1, in <module>
    from . import postgresql, mysql, sqlite, mssql, oracle  # pragma: no cover
ImportError: cannot import name 'mysql'

标签： pythonalembic

解决方案

你应该app.run()在最后打电话。或更好

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

port如果你想喜欢这个，你可以改变app.run(port=5000)

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