[Python] Get fields from a specific Jira issue

I'm trying to get all the fields and values from a specific issue my code:

authenticated_jira = JIRA(options={'server': self.jira_server}, basic_auth=(self.jira_username, self.jira_password))
issue = authenticated_jira.issue(self.id)
print issue.fields()


Instead of returning the list of fields it returns:

<jira.resources.PropertyHolder object at 0x108431390>

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