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Speed up relative re-imports into absolute imports #2862

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scoder opened this Issue Feb 23, 2019 · 0 comments

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scoder commented Feb 23, 2019

Cython has to know the qualified module name at compile time, so the absolute package path of a relative import is actually known at compile time. We cannot change the way relative first imports work in general, because they are actually looked up relative to the current package, but we can still speed up re-imports (which are actually not that uncommon). Cython can construct the qualified name of a relative module import at compile time and look that up in sys.modules (as done in the ImportDottedModule helper function for absolute imports).

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