human
I wrote the below code

    def get_content(file_path):
        return file_path.getContent()
    def content_mismatches(original):
        return mismatch(original.mismatched, ('%s    has    unexpected    contents:\n%s' % (original.mismatched.path, original.describe())), original.get_details())
    return MatchesAll(file_exists(), OnMismatch(content_mismatches, AfterPreprocessing(get_content, matcher, annotate=False)), first_only=True)

What's a good function header?

=====
Here's a good function header?
assistant
#Here's a good function header.

def file_contents(matcher):