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Exercises in Programming Style
book

Exercises in Programming Style

by Cristina Videira Lopes
November 2015
Intermediate to advanced content levelIntermediate to advanced
304 pages
5h 23m
English
Chapman and Hall/CRC
Content preview from Exercises in Programming Style

Chapter 23

Declared Intentions

image

23.1 Constraints

  • Existence of a type enforcer.
  • Procedures and functions declare what types of arguments they expect.
  • If callers send arguments of types that aren't expected, type errors are raised, and the procedures/functions are not executed.

23.2 A Program in this Style

  1 #!/usr/bin/env python
  2 import sys, re, operator, string, inspect
  3
  4 #
  5 # Decorator for enforcing types of arguments in method calls
  6 #
  7 class AcceptTypes():
  8 def __init__(self, *args):
  9  self._args = args
 10
 11 def __call__(self, f):
 12  def wrapped_f(*args):
 13    for i in range(len(self._args)):
 14    if type(args[i]) <> self._args[i]: ...
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Publisher Resources

ISBN: 9781482227376