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    >>> normalize_pre('BETA')
    'b'
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    'rc'

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        (?P<pre>                                          # pre-release
            [._-]?+
            (?P<pre_l>alpha|a|beta|b|preview|pre|c|rc)
            [._-]?+
            (?P<pre_n>[0-9]+)?
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                (?P<post_n2>[0-9]+)?
            )
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        (?P<dev>                                          # dev release
            [._-]?+
            (?P<dev_l>dev)
            [._-]?+
            (?P<dev_n>[0-9]+)?
        )?+
    )
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edddddd�													d:d��Zd;d�Zed<d��Zd=d�Zd>�fd�Zd>�fd�Zd?�fd�Zd>�fd �Zd>�fd!�Zd?�fd"�Z		d@d#�ZdAd$�Zeed%�dBd&���Zej<ed%�dCd'���ZdDd(�ZdDd)�Z edDd*��Z!ed=d+��Z"edEd,��Z#edFd-��Z$edGd.��Z%edGd/��Z&edHd0��Z'edDd1��Z(edDd2��Z)edId3��Z*edId4��Z+edId5��Z,ed=d6��Z-ed=d7��Z.ed=d8��Z/�xZ0S)Jr5a�This class abstracts handling of a project's versions.

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    >>> v1
    <Version('1.0a5')>
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    True
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    >>> v1 > v2
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    :class:`Version` is immutable; use :meth:`__replace__` to change
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    .. versionchanged:: 26.2

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        <Version('1.2.3')>
        >>> Version.from_parts(release=(0,1,0), pre=("b", 1))
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