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é N)Ú add_metaclass)ÚMYPY_CHECK_RUNNING)ÚOptional)Ú Distribution)ÚInstallRequirement)Ú PackageFinderc s< e Zd ZdZ fddZejdd Zejdd Z Z S )ÚAbstractDistributiona A base class for handling installable artifacts.
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The requirements for anything installable are as follows:
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(or we can't correctly handle the non-upgrade case).
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- for packages with setup requirements, we must also be able
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to determine their requirements without installing additional
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- we must be able to create a Distribution object exposing the
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