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This has four improvements:

  • Skip placeholders, they are not guaranteed to have a correct fullname.
  • Skip nodes from builtins/typing, these don't add anything.
  • Don't use rsplit(".") on variables/functions recursively, always use enclosing class.
  • (Most importantly) add missing maxsplit=1.

cc @JukkaL

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Diff from mypy_primer, showing the effect of this PR on open source code:

AutoSplit (https://github.com/Toufool/AutoSplit)
-   File "/tmp/mypy_primer/mypy_old/venv/bin/mypy", line 7, in <module>
+   File "/tmp/mypy_primer/mypy_new/venv/bin/mypy", line 7, in <module>
-   File "/tmp/mypy_primer/mypy_old/venv/lib/python3.13/site-packages/mypy/__main__.py", line 15, in console_entry
+   File "/tmp/mypy_primer/mypy_new/venv/lib/python3.13/site-packages/mypy/__main__.py", line 15, in console_entry
-   File "/tmp/mypy_primer/mypy_old/venv/lib/python3.13/site-packages/mypy/main.py", line 127, in main
+   File "/tmp/mypy_primer/mypy_new/venv/lib/python3.13/site-packages/mypy/main.py", line 127, in main
-   File "/tmp/mypy_primer/mypy_old/venv/lib/python3.13/site-packages/mypy/main.py", line 211, in run_build
+   File "/tmp/mypy_primer/mypy_new/venv/lib/python3.13/site-packages/mypy/main.py", line 211, in run_build
-   File "/tmp/mypy_primer/mypy_old/venv/lib/python3.13/site-packages/mypy/build.py", line 196, in build
+   File "/tmp/mypy_primer/mypy_new/venv/lib/python3.13/site-packages/mypy/build.py", line 196, in build
-   File "/tmp/mypy_primer/mypy_old/venv/lib/python3.13/site-packages/mypy/build.py", line 272, in _build
+   File "/tmp/mypy_primer/mypy_new/venv/lib/python3.13/site-packages/mypy/build.py", line 272, in _build
-   File "/tmp/mypy_primer/mypy_old/venv/lib/python3.13/site-packages/mypy/build.py", line 2946, in dispatch
+   File "/tmp/mypy_primer/mypy_new/venv/lib/python3.13/site-packages/mypy/build.py", line 2946, in dispatch
-   File "/tmp/mypy_primer/mypy_old/venv/lib/python3.13/site-packages/mypy/build.py", line 3346, in process_graph
+   File "/tmp/mypy_primer/mypy_new/venv/lib/python3.13/site-packages/mypy/build.py", line 3346, in process_graph
-   File "/tmp/mypy_primer/mypy_old/venv/lib/python3.13/site-packages/mypy/build.py", line 3475, in process_stale_scc
+   File "/tmp/mypy_primer/mypy_new/venv/lib/python3.13/site-packages/mypy/build.py", line 3475, in process_stale_scc
-   File "/tmp/mypy_primer/mypy_old/venv/lib/python3.13/site-packages/mypy/build.py", line 2493, in write_cache
+   File "/tmp/mypy_primer/mypy_new/venv/lib/python3.13/site-packages/mypy/build.py", line 2493, in write_cache
-   File "/tmp/mypy_primer/mypy_old/venv/lib/python3.13/site-packages/mypy/cache.py", line 28, in __init__
+   File "/tmp/mypy_primer/mypy_new/venv/lib/python3.13/site-packages/mypy/cache.py", line 28, in __init__

@ilevkivskyi ilevkivskyi merged commit 00f2b29 into python:master Sep 25, 2025
20 checks passed
@ilevkivskyi ilevkivskyi deleted the simplify-deps branch September 25, 2025 16:00
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