title: jira python customfield
body: <p>How do you determine the name of a custom field in jira-python?</p>
  
  <p>When I retrieve an issue, my custom fields show up as customfield_xxx</p>
  
  <p>The names on my screen are 'project', 'name', 'due date', etc.
  Short of putting a value in each field, then seeing where it appears
  when I re-read the issue.</p>
  
  <p>That is I can put 'a' in one of my fields, then read the issue, and find that
  customfield_10801 (or whatever) has the value 'a'.  But is there a general
  way to find, for example, if my custom field is 'due date', which customfield_xxx
  does it get mapped to?</p>
  
  <p>Or, in the JIRA GUI, how would I look up these customfield #'s.</p>