utils.py

   1 import string
   2
   3
   4 def get_word_at_pos(str, pos):
   5     if pos < 0:
   6         return None
   7     if pos >= len(str):
   8         pos = len(str) - 1
   9     word_chars = string.ascii_letters + string.digits + "._"
  10     if str[pos] not in word_chars:
  11         return None
  12     beg = pos
  13     while beg >= 1 and str[beg - 1] in word_chars:
  14         beg -= 1
  15     end = pos
  16     while end < len(str) - 1 and str[end + 1] in word_chars:
  17         end += 1
  18     return str[beg:end + 1]