Exercises in Programming Style

Chapter 29

Dataspaces

29.1 Constraints

• Existence of one or more units that execute concurrently.
• Existence of one or more data spaces where concurrent units store and retrieve data.
• No direct data exchanges between the concurrent units, other than via the data spaces.

29.2 A Program in this Style

  1 #!/usr/bin/env python
  2 import re, sys, operator, Queue, threading
  3
  4 # Two data spaces
  5 word_space = Queue.Queue()
  6 freq_space = Queue.Queue()
  7
  8 stopwords = set(open('../stop_words.txt').read().split(','))
  9
 10 # Worker function that consumes words from the word space
 11 # and sends partial results to the frequency space
 12 def process_words(): ...