Note: Simply coercing the field to a string or unicode will render it as
if it was called with no arguments.
+ .. automethod:: __html__
+ Many template engines use the __html__ method when it exists on a
+ printed object to get an 'html-safe' string that will not be
+ auto-escaped. To allow for printing a bare field without calling it,
+ all WTForms fields implement this method as well.