title: Django help_text line length convention
body: <p>I was wondering what the convention was for line length when inputting help_text and other hard-coded long lines into Python/Django. I have read PEP-8, where line length is covered for code and comments, however I am not sure how this applies for long strings of text.</p>
  
  <p>This is the for the field 'explanation_text', and the help_text field option.</p>
  
  <pre><code>class Question(models.Model):
      questionnaire = models.ForeignKey(Questionnaire, on_delete=models.CASCADE)
      title = models.CharField(max_length=150, blank=False)
      category = models.CharField(max_length=20, blank=False)
      created_date = models.DateTimeField(default=datetime.now, blank=True)
      explanation_text = models.TextField(
          blank=True,
          help_text="Explanation text goes here. Candidates will be able to see this after they have taken a questionnaire. To change this, refer to the setting on questionnaire administration. Max length is 1000 characters.",
          max_length=1000)
  
      def __str__(self):
          return self.title
  </code></pre>