Exercises in Programming Style

Chapter 16

Introspective

16.1 Constraints

• The problem is decomposed using some form of abstraction (procedures, functions, objects, etc.).
• The abstractions have access to information about themselves and others, although they cannot modify that information.

16.2 A Program in this Style

  1 #!/usr/bin/env python
  2 import sys, re, operator, string, inspect
  3
  4 def read_stop_words():
  5 """ This function can only be called from a function
  6  named extract_words."""
  7 # Meta-level data: inspect.stack()
  8 if inspect.stack()[1][3] != 'extract_words':
  9  return None
 10
 11 with open('../stop_words.txt') as f:
 12  stop_words = f.read().split(',')
 13 stop_words.extend(list(string.ascii_lowercase)) ...