关于python:importerror:virtualenv中没有名为flask.ext.sqlacalchemy的模块

ImportError: No module named flask.ext.sqlalchemy in virtualenv

下面是我在python3中尝试从flask运行以下代码时遇到的主要错误"sqlAlchemy import sqlAlchemy"

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Traceback (most recent call last):
File"/home/jsnyder10/.local/bin/flask", line 11, in <module>
sys.exit(main())
File"/home/jsnyder10/.local/lib/python3.5/site-packages/flask/cli.py", line 513, in main
cli.main(args=args, prog_name=name)
File"/home/jsnyder10/.local/lib/python3.5/site-packages/flask/cli.py", line 380, in main
return AppGroup.main(self, *args, **kwargs)
File"/home/jsnyder10/.local/lib/python3.5/site-packages/click/core.py", line 697, in main
rv = self.invoke(ctx)
File"/home/jsnyder10/.local/lib/python3.5/site-packages/click/core.py", line 1066, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File"/home/jsnyder10/.local/lib/python3.5/site-packages/click/core.py", line 895, in invoke
return ctx.invoke(self.callback, **ctx.params)
File"/home/jsnyder10/.local/lib/python3.5/site-packages/click/core.py", line 535, in invoke
return callback(*args, **kwargs)
File"/home/jsnyder10/.local/lib/python3.5/site-packages/click/decorators.py", line 64, in new_func
return ctx.invoke(f, obj, *args[1:], **kwargs)
File"/home/jsnyder10/.local/lib/python3.5/site-packages/click/core.py", line 535, in invoke
return callback(*args, **kwargs)
File"/home/jsnyder10/.local/lib/python3.5/site-packages/flask/cli.py", line 423, in run_command
app = DispatchingApp(info.load_app, use_eager_loading=eager_loading)
File"/home/jsnyder10/.local/lib/python3.5/site-packages/flask/cli.py", line 152, in __init__
self._load_unlocked()
File"/home/jsnyder10/.local/lib/python3.5/site-packages/flask/cli.py", line 176, in _load_unlocked
self._app = rv = self.loader()
File"/home/jsnyder10/.local/lib/python3.5/site-packages/flask/cli.py", line 237, in load_app
rv = locate_app(self.app_import_path)
File"/home/jsnyder10/.local/lib/python3.5/site-packages/flask/cli.py", line 90, in locate_app
__import__(module)
File"/home/jsnyder10/Documents/CS50/pset7/pset7/finance/application.py", line 2, in <module>
from flask_sqlalchemy import SQLAlchemy
ImportError: No module named 'flask_sqlalchemy'

不确定它是否相关，但当我更新sqlachemy时，它会给出以下pip提示。我尝试更新pip，但出于某种原因9.0.1版说它已升级，但实际上没有更新。

1 2	You are using pip version 8.1.1, however version 9.0.1 is available. You should consider upgrading via the 'pip install --upgrade pip' command.

下面是我运行pip list时得到的结果，您可以看到sqlAlchemy和flask sqlAlchemy都已安装。

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DEPRECATION: The default format will switch to columns in the future. You can use --format=(legacy|columns) (or define a format=(legacy|columns) in your pip.conf under the [list] section) to disable this warning.
appdirs (1.4.3)
click (6.7)
Flask (0.12.1)
Flask-SQLAlchemy (2.2)
itsdangerous (0.24)
Jinja2 (2.9.6)
MarkupSafe (1.0)
packaging (16.8)
pip (9.0.1)
pyparsing (2.2.0)
setuptools (35.0.2)
six (1.10.0)
SQLAlchemy (1.1.9)
Werkzeug (0.12.1)
wheel (0.29.0)

我猜它使用的是不正确的python版本。我从来没有深入到这个问题的底部，但我的虚拟机，使一个新的修复它。谢谢你们的帮助，希望我能修好它。