another solution

PythonCHB · PythonCHB · commit f225977fd1b1 · 2014-11-04T17:24:20.000-08:00
diff --git a/Solutions/Session05/get_langs.py b/Solutions/Session05/get_langs.py
@@ -0,0 +1,31 @@
+#!/usr/bin/env python
+
+"""
+script to determine what programming languages students came to this
+class with
+
+This version updated to use collections.Counter, to count and maintain
+a set at the same time.
+
+"""
+
+import collections # lots of neat stuff in there
+
+file_path = '../../Examples/Session01/students.txt'
+
+# use a counter to ensure unique values and keep track of count
+all_langs = collections.Counter()
+
+f = open(file_path) # default read text mode
+
+f.readline() # read and toss the header
+
+for line in f:
+    langs = line.split(':')[1]
+    langs = langs.split(',')
+    for lang in langs:
+        lang = lang.strip().lower()
+        if lang: # don't want empty strings
+            all_langs[lang] += 1
+for lang, count in all_langs.items():
+    print "%10s: %i students"%(lang, count)
diff --git a/slides_sources/ToDo.txt b/slides_sources/ToDo.txt
@@ -4,19 +4,11 @@ Future Sessions:
 
 Sorting!
 
+add pathlib examples
 
 For Session 6:
 
-if something is None, True, False
-(rich comparisons)
+Counter() demo -- in the get languages example.
 
-reminder about opening file in binary mode.
-
-show defaultdict -- Carolyn
-
-you don't actually need to use the result of a list comp:
-
-for i, st in zip( divisors, sets):
-    [ st.add(j) for j in range(21) if not j%i ]
 
 lambda and sorting...
