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Various errors may be raised if a problem occurs during downloading. r7 z.pyrP N)r� r r� � _download_urlrL rG r1 � gen_setuprW rD r� r( r� �fetch_distribution)r� r% �tmpdirrB �foundr4 rF r& r& r' r8 , s zPackageIndex.downloadc s� �j d|� i �d}d � ����fdd� }|rH�j� �j|� ||�}| r`|dk r`|||�}|dkr��jdk rz�j� ||�}|dkr�| r��j|� ||�}|dkrjd�r�dp�d|� n�j d|� |j|jd �S dS ) a| Obtain a distribution suitable for fulfilling `requirement` `requirement` must be a ``pkg_resources.Requirement`` instance. If necessary, or if the `force_scan` flag is set, the requirement is searched for in the (online) package index as well as the locally installed packages. If a distribution matching `requirement` is found, the returned distribution's ``location`` is the value you would have gotten from calling the ``download()`` method with the matching distribution's URL or filename. If no matching distribution is found, ``None`` is returned. 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