title: In the Jira Python API, how can I get a list of all labels used in a project?
body: <p>I am using the python API for Jira.  I would like to get a list of all the labels that are being used in a project.  I know that issue.fields.labels will get me just the labels of an issue, but I am interested in looping through all the labels used in a project.  Found this to list all components in a project
  components = jira.project_components(projectID)</p>
  
  <p>Am looking for something similar, but for labels...</p>