Merge pull request #54 from liangpeili/main

keep it consistent with solution in 1_4

Exercises/ex2_2.md

@@ -152,7 +152,7 @@ The key feature that makes this work is that a defaultdict
 automatically initializes elements for you--allowing an insertion of a
 new element and an `append()` operation to be combined together.
 
-## (c) Data Analysis Challenge
+## (d) Data Analysis Challenge
 
 In the last exercise you just wrote some code to read CSV-data related
 to the Chicago Transit Authority.  For example, you can grab the data

Solutions/1_6/pcost.py

@@ -12,7 +12,7 @@ def portfolio_cost(filename):
 
             # This catches errors in int() and float() conversions above
             except ValueError as e:
-                print("Couldn't parse:", line)
+                print("Couldn't parse:", repr(line))
                 print("Reason:", e)
 
     return total_cost