title: Why is it always "module 'xxx' has no attribute 'xxx'"?
body: <p>i am using pycharm professional, what is bugging me today is, lots of modules i call seems won't work, forexample, plotly, tabula-py, and camelot.</p>
  
  <p>From the attached pic below, you can see, i am even working in virtual environment, and just did pip install camelot.</p>
  
  <p>For example, now i tried to import camelot, and read_pdf. An error comes up, and says "NO module named "camelot". </p>
  
  <p>I tried pip remove, and pip install again; i have also tried pip3 install, similar errors showed up, saying no such module, or attribute.</p>
  
  <p>What is wrong with my pycharm? and how to fix it?
  <a href="https://i.stack.imgur.com/qERER.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/qERER.jpg" alt="m"></a>
  By the way, in the case of plotly. I tried open it with Terminal > jupyter notebook, then run the code, it worked. </p>