langner

def similar_first_author(author1, author2):
    """Determine whether two first authors have the same names.

    Since there can be various fluctuations in first names and initials, we will
    only check the first word in the author string and the first letter of the
    second word. Although the second word is usually the first name, there will
    be exceptions for multi-word last names, but this will be a small minority
    and still passes our test. In case there is just a single word, use just that.
    """
    author1 = author1.lower().decode('utf-8')

langner

"""Transformation of trees into Prufer sequence and back.

The Prufer sequence of a labeled tree is a unique seqience associated
with that tree on length n-2 where there are n vertices in the tree.
More information: https://en.wikipedia.org/wiki/Prüfer_sequence

Copyright 2015 Karol M. Langner, Google Inc.
Licensed under the Apache License, Version 2.0
http://www.apache.org/licenses/LICENSE-2.0
"""