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This is a sample doctest in a text file.
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In this example, we'll rely on a global variable being set for us
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already:
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>>> favorite_color
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'blue'
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We can make this fail by disabling the blank-line feature.
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>>> if 1:
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... print('a')
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... print()
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... print('b')
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a
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<BLANKLINE>
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b
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