title: Reading and writing environment variables in Python?
body: <p>My python script which calls many python functions and shell scripts. I want to set a environment variable in Python (main calling function) and all the daughter processes including the shell scripts to see the environmental variable set.</p>
  
  <p>I need to set some environmental variables like this:</p>
  
  <pre><code>DEBUSSY 1
  FSDB 1
  </code></pre>
  
  <p><code>1</code> is a number, not a string. Additionally, how can I read the value stored in an environment variable? (Like <code>DEBUSSY</code>/<code>FSDB</code> in another python child script.)</p>