title: Global variable changed by multiple functions - how to declare in Python
body: <p>I am using some variable in multiple functions.<br>
  This includes changing the variable values by each of those functions.<br>
  I already declared the variable as 'global' in the first function.<br>
  Should I declare this variable again and again as <code>global</code> in each function (and this will not overwrite the first <code>global</code> variable I declared in the first function) or I should not declare it again as <code>global</code> in all those functions (but the local variables there still will be seen as <code>global</code> since I already declared this variable so first time)?  </p>