Aluode/PerceptionLabPortable
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�Zddd�Zd dd�Zd dd�Z dS ) � Requirementz�Parse a requirement.10 11 Parse a given requirement string into its parts, such as name, specifier,12 URL, and extras. Raises InvalidRequirement on a badly-formed requirement13 string.14 �requirement_string�str�return�Nonec 15 C s� zt |�}W n ty } ztt|��|�d }~ww |j| _|jp"d | _t|jp)g �| _t|j �| _ d | _16|j17d urIt � t �| _18t
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