use lists instead of tuples in generator chapter too [thanks A.H.]

examples/plural2.py

@@ -31,11 +31,11 @@ def match_default(noun):
 def apply_default(noun):
     return noun + 's'
 
-rules = ((match_sxz, apply_sxz),
-         (match_h, apply_h),
-         (match_y, apply_y),
-         (match_default, apply_default)
-         )
+rules = [[match_sxz, apply_sxz],
+         [match_h, apply_h],
+         [match_y, apply_y],
+         [match_default, apply_default]
+         ]
 
 def plural(noun):
     for matches_rule, apply_rule in rules:

examples/plural3.py

@@ -12,7 +12,7 @@ def build_match_and_apply_functions(pattern, search, replace):
         return re.search(pattern, word)
     def apply_rule(word):
         return re.sub(search, replace, word)
-    return (matches_rule, apply_rule)
+    return [matches_rule, apply_rule]
 
 patterns = \
   [

examples/plural4.py

@@ -12,7 +12,7 @@ def build_match_and_apply_functions(pattern, search, replace):
         return re.search(pattern, word)
     def apply_rule(word):
         return re.sub(search, replace, word)
-    return (matches_rule, apply_rule)
+    return [matches_rule, apply_rule]
 
 rules = []
 pattern_file = open('plural4-rules.txt')

examples/plural5.py

@@ -12,7 +12,7 @@ def build_match_and_apply_functions(pattern, search, replace):
         return re.search(pattern, word)
     def apply_rule(word):
         return re.sub(search, replace, word)
-    return (matches_rule, apply_rule)
+    return [matches_rule, apply_rule]
 
 def rules():
     for line in open('plural5-rules.txt'):

examples/plural6.py

@@ -12,13 +12,13 @@ def build_match_and_apply_functions(pattern, search, replace):
         return re.search(pattern, word)
     def apply_rule(word):
         return re.sub(search, replace, word)
-    return (matches_rule, apply_rule)
+    return [matches_rule, apply_rule]
 
 class LazyRules:
-    rules_f = 'plural6-rules.txt'
+    rules_filename = 'plural6-rules.txt'
 
     def __init__(self):
-        self.pattern_file = open(self.rules_f)
+        self.pattern_file = open(self.rules_filename)
         self.cache = []
 
     def __iter__(self):