在我的虚拟环境中运行我的Python脚本？

Question

Total python noob here, I want to run my .py flask api file, i cd to my directory, activate my python virtual env, then i try run.py

Issue is that it prints:

$ python run.py                                             

Traceback (most recent call last): File "run.py", line 1, in from flask_sqlalchemy import SQLAlchemy ImportError: No module named flask_sqlalchemy

As far as im aware as im in my virtualenv and have my packages installed, this shouldnt happen. Trying to pip3 install on any packages shows them as already existing.

To further assist with the issue, i tried to run the script inside pycharm and i get the following error prints in the log:`Traceback (most recent call last):

  File "/Users/Jack/Developer/Python/lift_api/run.py", line 26, in <module>
    sqlAlchemy.create_all() 
  File "/Users/Jack/Developer/Python/lift_api/liftapi/lib/python3.6/site-packages/flask_sqlalchemy/__init__.py", line 1007, in create_all
    self._execute_for_all_tables(app, bind, 'create_all')
  File "/Users/Jack/Developer/Python/lift_api/liftapi/lib/python3.6/site-packages/flask_sqlalchemy/__init__.py", line 999, in _execute_for_all_tables
    op(bind=self.get_engine(app, bind), **extra)
  File "/Users/Jack/Developer/Python/lift_api/liftapi/lib/python3.6/site-packages/flask_sqlalchemy/__init__.py", line 941, in get_engine
    return connector.get_engine()
  File "/Users/Jack/Developer/Python/lift_api/liftapi/lib/python3.6/site-packages/flask_sqlalchemy/__init__.py", line 543, in get_engine
    self._engine = rv = sqlalchemy.create_engine(info, **options)
  File "/Users/Jack/Developer/Python/lift_api/liftapi/lib/python3.6/site-packages/sqlalchemy/engine/__init__.py", line 387, in create_engine
    return strategy.create(*args, **kwargs)
  File "/Users/Jack/Developer/Python/lift_api/liftapi/lib/python3.6/site-packages/sqlalchemy/engine/strategies.py", line 80, in create
    dbapi = dialect_cls.dbapi(**dbapi_args)
  File "/Users/Jack/Developer/Python/lift_api/liftapi/lib/python3.6/site-packages/sqlalchemy/dialects/postgresql/psycopg2.py", line 554, in dbapi
    import psycopg2
ModuleNotFoundError: No module named 'psycopg2'`

Anyone have an idea?

Answer 1

要使用python 3.x运行代码，请使用python3命令。

python3 run.py

Answer 2

What is saying what it needs - psycopg2. If you are on Ubuntu it can help:

sudo apt install libpq-dev python-dev

Then don't forget to install flask-sqlalchemy and other libraries while your virtualenv activated.