title: run unittests from a command prompt
body: <p>I have created python files and unittests but I do not understand how can i run all the tests in one go from command prompt.</p>
  
  <p>file structure</p>
  
  <pre><code>- py
    - __init__.py
    - file1.py
    - file2.py
  - tests
    __init__.py
    - test_file1.py
    - test_file2.py
  </code></pre>
  
  <p>Please let me know the same.
  when i try to run tests using nosetests, it says me </p>
  
  <pre><code>no module name file1
  no module name file2
  </code></pre>