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Z!make_requirement_from_install_req�appendr r/ r0 r � RLResolver�resolver1 r Zget_installation_errorr � raise_fromr �mapping�valuesZget_install_requirementZget_dist_to_uninstall�should_reinstallr# �parsed_versionr: r � is_editableZ source_link� is_yanked�format� yanked_reasonr* r+ �add_named_requirement)r2 � root_reqsr8 r6 r7 � requirements�req�problemr9 �rZproviderZreporter�resolverZ try_to_avoid_resolution_too_deep�e�error�req_set� candidate�ireqZinstalled_distr; �msgr4 r4 r5 rD Q sx zResolver.resolvec C sN | j dk std��| j j}t|�}t|jj� tjt |d�dd�}dd� |D �S )a Get order for installation of requirements in RequirementSet. The returned list contains a requirement before another that depends on it. This helps ensure that the environment is kept consistent as they get installed one-by-one. The current implementation creates a topological ordering of the dependency graph, while breaking any cycles in the graph at arbitrary points. 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Cycles in the graph result would result in node being revisited while also being it's own path. In this case, take no action. This helps ensure we don't get stuck in a cycle. When assigning weight, the longer path (i.e. larger length) is preferred. c s^ | �kr d S �j | � x� j| �D ] }�|� q"W �j| � �j| d�}t|t����| < d S )Nr )rA Z iter_children�remove�get�max�len)�node�childZlast_known_parent_count)ra �path�visitr[ r4 r5 rt � s z&get_topological_weights.<locals>.visitNr )r= r- rp )ra r4 )ra rs rt r[ r5 rb � s rb c C s t | d �}|| |fS )a) Key function used to sort install requirements for installation. Based on the "weight" mapping calculated in ``get_installation_order()``. 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