def report(self, fileobj=None, indent=0):
"""
Generates a text report on the differences (if any) between two
objects, and either returns it as a string or writes it to a file-like
object.
Parameters
----------
fileobj : file-like object or None (optional)
If `None`, this method returns the report as a string. Otherwise it
returns `None` and writes the report to the given file-like object
(which must have a `.write()` method at a minimum).
indent : int
The number of 4 space tabs to indent the report.
Returns
-------
report : str or None
"""
return_string = False
if fileobj is None:
fileobj = StringIO()
return_string = True
self._fileobj = fileobj
self._indent = indent # This is used internally by _writeln
self._report()
if return_string:
return fileobj.getvalue()
