refactor: reduce reliance on regex in path handling #1968
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This change tries to modernize the way we handle paths in nbgrader by using pathlib.Path and centralizing logic for searching and extracting information from paths into CourseDirectory. By using `Path(root).glob(pat)` instead of `glob.glob(root / pat)`, we can avoid some issues of needing to escape CourseDirectory.root because the glob will be scoped underneath a fixed path. Introduces a new `CourseDirectory.find_assignments` method to help locate assignment directories across steps and students. Fixes jupyter#1965
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The test formerly relied on a normal directory being missing. This commit uses /dev/null as the exchange directory to ensure it will always be missing.
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This change tries to modernize the way we handle paths in nbgrader by using pathlib.Path and centralizing logic for searching and extracting information from paths into CourseDirectory.
By using
Path(root).glob(pat)instead ofglob.glob(root / pat), we can avoid some issues of needing to escape CourseDirectory.root because the glob will be scoped underneath a fixed path.Introduces a new
CourseDirectory.find_assignmentsmethod to help locate assignment directories across steps and students.Fixes #1965