Abstraction barriers make programs easier to maintain and to modify. The fewer
functions that depend on a particular representation, the fewer changes are
required when one wants to change that representation.
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2.2 Data Abstraction(x) * numer(x), denom(x) * denom(x))
Assuming that rationals are represented as two-element lists would violate two
abstraction barriers.
>>> def square_rational_violating_twice(x):
return [x[0] * x[0], x[1] * x[1]]
<span>Abstraction barriers make programs easier to maintain and to modify. The fewer
functions that depend on a particular representation, the fewer changes are
required when one wants to change that representation. All of these
implementations of square_rational have the correct behavior, but only the
first is robust to future changes. The square_rational function would not
require updating ev Summary
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