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Oops, typo.
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@ -53,7 +53,7 @@ command.
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Whenever joining more than two strings, use string interpolation, not addition:
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s = x + y + z # Bad.
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s = '%s%s%s' % (x, y, z) # Good.
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s = ''.join(x, y, z) # Best, but not as general.
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s = ''.join([x, y, z]) # Best, but not as general.
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This has to do with efficiency; the intermediate string x+y is made (and thus
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copied) before x+y+z is made, so it's less efficient.
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