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i�f90�@s>dZddlZGdd�d�ZGdd�de�ZGdd�de�ZdS)	a�Provides classes to represent module version numbers (one class for
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    representation; if the string is an invalid version number,
    'parse' raises a ValueError exception
  * the class constructor takes an optional string argument which,
    if supplied, is passed to 'parse'
  * __str__ reconstructs the string that was passed to 'parse' (or
    an equivalent string -- ie. one that will generate an equivalent
    version number instance)
  * __repr__ generates Python code to recreate the version number instance
  * _cmp compares the current instance with either another instance
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    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
        2.7.2.2
        1.3.a4
        1.3pl1
        1.3c4

    The rationale for this version numbering system will be explained
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        1.5.1
        1.5.2b2
        161
        3.10a
        8.02
        3.4j
        1996.07.12
        3.2.pl0
        3.1.1.6
        2g6
        11g
        0.960923
        2.2beta29
        1.13++
        5.5.kw
        2.0b1pl0

    In fact, there is no such thing as an invalid version number under
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