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                開發高質量軟件的方法之一是為每一個函數開發測試代碼,并且在開發過程中經常進行測試。 doctest?模塊提供了一個工具,掃描模塊并根據程序中內嵌的文檔字符串執行測試。測試構造如同簡單的將它的輸出結果剪切并粘貼到文檔字符串中。通過用戶提供的例子,它發展了文檔,允許 doctest 模塊確認代碼的結果是否與文檔一致: ~~~ def average(values): """Computes the arithmetic mean of a list of numbers. >>> print(average([20, 30, 70])) 40.0 """ return sum(values, 0.0) / len(values) import doctest doctest.testmod() # automatically validate the embedded tests ~~~ unittest?模塊不像?doctest?模塊那么容易使用,不過它可以在一個獨立的文件里提供一個更全面的測試集: ~~~ import unittest class TestStatisticalFunctions(unittest.TestCase): def test_average(self): self.assertEqual(average([20, 30, 70]), 40.0) self.assertEqual(round(average([1, 5, 7]), 1), 4.3) self.assertRaises(ZeroDivisionError, average, []) self.assertRaises(TypeError, average, 20, 30, 70) unittest.main() # Calling from the command line invokes all tests ~~~
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