OK, so explaining the passive aggressive style with monadic exceptions in a language that already has exceptions does not work. Back to regular exceptions in style 23. I left the monadic version as an academically interesting variation. In the process of returning to basic exceptions, I needed to clarify the tantrum style a little better too.

23-passive-aggressive/README.md

@@ -3,15 +3,16 @@ Style #23
 
 Constraints:
 
-- A sequence of functions should not proceed if preconditions aren't
-  met or if errors occur
+- Every single procedure and function checks the sanity of its
+  arguments and refuses to continue when the arguments are
+  unreasonable, throwing an exception
 
-- Core program functions have no exception handling, not even the main function
+- When calling out other functions, core program functions don't check for errors
 
-- The final result of the function chain should show the failure, if one occurred
+- Exception handling occurs only at the top level of a function call chain
 
 Possible names:
 
 - Passive aggressive
-- Monadic Exceptions
+
 

23-passive-aggressive/tf-23-monadic.py

@@ -0,0 +1,85 @@
+#!/usr/bin/env python
+import sys, re, operator, string
+
+#
+# The PassiveAggressive class for this example
+#
+class TFPassiveAggressive:
+    def __init__(self, v):
+        self._e = None
+        self._offending_func = None
+        self._value = v
+
+    def bind(self, func):
+        if self._e == None:
+            try:
+                self._value = func(self._value)
+            except Exception as e:
+                self._e = e
+                self._offending_func = func
+        return self
+
+    def printme(self):
+        if self._e == None:
+            print self._value
+        else:
+            print self._e, " in ", self._offending_func.__name__
+
+#
+# The functions
+#
+def get_input(arg):
+    assert(len(sys.argv) > 1), "You idiot! I need an input file! I quit!"
+    return sys.argv[1]
+
+def extract_words(path_to_file):
+    assert(type(path_to_file) is str), "I need a string! I quit!" 
+    assert(path_to_file), "I need a non-empty string! I quit!" 
+
+    with open(path_to_file) as f:
+        data = f.read()
+    pattern = re.compile('[\W_]+')
+    word_list = pattern.sub(' ', data).lower().split()
+    return word_list
+
+def remove_stop_words(word_list):
+    assert(type(word_list) is list), "I need a list! I quit!"
+
+    with open('../stop_words.txt') as f:
+        stop_words = f.read().split(',')
+    # add single-letter words
+    stop_words.extend(list(string.ascii_lowercase))
+    return [w for w in word_list if not w in stop_words]
+
+def frequencies(word_list):
+    assert(type(word_list) is list), "I need a list! I quit!"
+    assert(word_list <> []), "I need a non-empty list! I quit!"
+
+    word_freqs = {}
+    for w in word_list:
+        if w in word_freqs:
+            word_freqs[w] += 1
+        else:
+            word_freqs[w] = 1
+    return word_freqs
+
+def sort(word_freqs):
+    assert(type(word_freqs) is dict), "I need a dictionary! I quit!"
+    assert(word_freqs <> {}), "I need a non-empty dictionary! I quit!"
+
+    return sorted(word_freqs.iteritems(), key=operator.itemgetter(1), reverse=True)
+
+def top25_freqs(word_freqs):
+    assert(type(word_freqs) is list), "I need a list! I quit!"
+    assert(word_freqs <> {}), "I need a non-empty dictionary! I quit!"
+
+    top25 = ""
+    for tf in word_freqs[0:25]:
+        top25 += str(tf[0]) + ' - ' + str(tf[1]) + '\n'
+    return top25
+
+#
+# The main function
+#
+TFPassiveAggressive(None).bind(get_input).bind(extract_words).bind(remove_stop_words).bind(frequencies).bind(sort).bind(top25_freqs).printme()
+

23-passive-aggressive/tf-23.py

@@ -1,30 +1,6 @@
 #!/usr/bin/env python
 import sys, re, operator, string
 
-#
-# The PassiveAggressive class for this example
-#
-class TFPassiveAggressive:
-    def __init__(self, v):
-        self._e = None
-        self._offending_func = None
-        self._value = v
-
-    def bind(self, func):
-        if self._e == None:
-            try:
-                self._value = func(self._value)
-            except Exception as e:
-                self._e = e
-                self._offending_func = func
-        return self
-
-    def printme(self):
-        if self._e == None:
-            print self._value
-        else:
-            print self._e, " in ", self._offending_func.__name__
-
 #
 # The functions
 #
@@ -81,5 +57,14 @@ def top25_freqs(word_freqs):
 #
 # The main function
 #
-TFPassiveAggressive(None).bind(get_input).bind(extract_words).bind(remove_stop_words).bind(frequencies).bind(sort).bind(top25_freqs).printme()
+try:
+    assert(len(sys.argv) > 1), "You idiot! I need an input file! I quit!"
+    word_freqs = sort(frequencies(extract_words(sys.argv[1])))
+
+    assert(len(word_freqs) > 25), "OMG! Less than 25 words! I QUIT!"
+    for tf in word_freqs[0:25]:
+        print tf[0], ' - ', tf[1]
+except Exception as e:
+        print "Something wrong: {0}".format(e)
+