Doctest: The Easiest Testing Tool(Chapter 2 of Python Testing Beginner's Guide)
时间：2010-11-28 来源：Ray Z
testable
1 def testable(x):2 r"""
3 The testable functin returns the square root of its parameter, or 3, whichever is larger.
4 >>> testable(7)
5 3.0
6 >>> testable(16)
7 4.0
8 >>> testable(9)
9 3.0
10 >>> testable(10) == 10 ** 0.5
11 True
12 """
13 if x < 9:
14 return 3.0
15 return x ** 0.5
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