U @vg?@sBdZddlZddlZddlmZddlmZddlmZddl m Z m Z m Z m Z mZddlmZddlmZmZdd lmZmZdd lmZerdd lmZmZmZmZmZmZdd l m!Z!dd l"m#Z#ddl$m%Z%ddl&m'Z'ddl(m)Z)ddl*m+Z+ee,e)ge)fZ-ee,ee)fZ.e/e0Z1dddZ2Gddde3Z4dS)ayDependency Resolution The dependency resolution in pip is performed as follows: for top-level requirements: a. only one spec allowed per project, regardless of conflicts or not. otherwise a "double requirement" exception is raised b. they override sub-dependency requirements. for sub-dependencies a. 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