Exercises in Programming Style

Chapter 17

Reflective

17.1 Constraints

• The program has access to information about itself, i.e. introspection.
• The program can modify itself – adding more abstractions, variables, etc. at runtime.

17.2 A Program in this Style

  1 #!/usr/bin/env python
  2 import sys, re, operator, string, os
  3
  4 #
  5 # Two down-to-earth things
  6 #
  7 stops = set(open("../stop_words.txt").read().split(",") + list(
  string.ascii_lowercase))
  8
  9 def frequencies_imp(word_list):
 10 word_freqs = {}
 11 for w in word_list:
 12  if w in word_freqs:
 13    word_freqs[w] += 1
 14  else:
 15    word_freqs[w] = 1
 16 return word_freqs
 17
 18 #
 19 # Let's write our functions as strings.