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PY.420 courses at Johns Hopkins

10,248 PY.420 courses at Johns Hopkins University, with prerequisites, ratings, workload, and what each one unlocks.

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Where the numbers come from: course listings from the Johns Hopkins 2025–2026 catalog; prerequisite links we have parsed and mapped. A course shows a figure only when we have it for that course. The official listing lives at sis.jhu.edu.