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  * __str__ reconstructs the string that was passed to 'parse' (or
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  * __repr__ generates Python code to recreate the version number instance
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    on the end.  The pre-release tag consists of the letter 'a' or 'b'
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    numbers are equal, then one with a pre-release tag will always
    be deemed earlier (lesser) than one without.

The following are valid version numbers (shown in the order that
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0.4       0.4.0  (these two are equivalent)
        0.4.1
        0.5a1
        0.5b3
        0.5
        0.9.6
        1.0
        1.0.4a3
        1.0.4b1
        1.0.4

The following are examples of invalid version numbers:

1
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        1.3.a4
        1.3pl1
        1.3c4

The rationale for this version numbering system will be explained
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    numerically, and the alphabetic components lexically.  The following
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1.5.1
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        3.10a
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        1.13++
        5.5.kw
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In fact, there is no such thing as an invalid version number under
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