title: How do I run my Python script? Why does the command line tell me "no such file or directory"?
body: <p>I have Python 2.7 installed at <code>C:\Python27</code> and I have added the path <code>C:\Python27\;</code> to the environment variables and <code>.py:</code> to PATHEXT. I am able to launch Python.</p>
  <p>I downloaded a folder <code>google-python-exercises</code> to my desktop, which contains a script <code>hello.py</code>.</p>
  <p>Following the advice <a href="https://developers.google.com/edu/python/set-up" rel="nofollow noreferrer">in the Google Developers course</a>, I try to run the script by using <code>python hello.py</code> at the command prompt.</p>
  <p>When I attempt this, I get the message: <code>python: can't open file 'hello.py: [Errno 2] No such file or directory</code>. What is wrong, and how am I supposed to fix it? I found that I can solve the problem by  running cmd from the folder, but this seems like a temporary solution.</p>