updade from Atlas repo

03-dict-set/index_default.py

@@ -5,9 +5,9 @@
 # tag::INDEX_DEFAULT[]
 """Build an index mapping word -> list of occurrences"""
 
-import sys
-import re
 import collections
+import re
+import sys
 
 WORD_RE = re.compile(r'\w+')
 
@@ -16,11 +16,11 @@ with open(sys.argv[1], encoding='utf-8') as fp:
     for line_no, line in enumerate(fp, 1):
         for match in WORD_RE.finditer(line):
             word = match.group()
-            column_no = match.start()+1
+            column_no = match.start() + 1
             location = (line_no, column_no)
             index[word].append(location)  # <2>
 
-# print in alphabetical order
+# display in alphabetical order
 for word in sorted(index, key=str.upper):
     print(word, index[word])
 # end::INDEX_DEFAULT[]