Multiple Python version repro

examples/multi-version/.bazelrc

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+common --enable_bzlmod
+
+common --lockfile_mode=off
+
+test --test_output=errors
+
+# add mypy_aspect and enable it by default
+build --aspects //:py.bzl%mypy_aspect
+build --output_groups=+mypy

examples/multi-version/.bazelversion

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+../../.bazelversion

examples/multi-version/MODULE.bazel

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+"rules_mypy multi-version test case"
+
+module(
+    name = "rules_mypy_examples__multi_version",
+    version = "0.0.0",
+)
+
+bazel_dep(name = "rules_mypy", version = "0.0.0")
+bazel_dep(name = "rules_python", version = "1.1.0")
+bazel_dep(name = "rules_uv", version = "0.21.0")
+
+local_path_override(
+    module_name = "rules_mypy",
+    path = "../..",
+)
+
+python = use_extension("@rules_python//python/extensions:python.bzl", "python")
+python.toolchain(python_version = "3.10")
+python.toolchain(python_version = "3.11")
+use_repo(python, "python_3_10", "python_3_11")
+
+pip = use_extension("@rules_python//python/extensions:pip.bzl", "pip")
+pip.parse(
+    hub_name = "pip_A",
+    python_version = "3.10",
+    requirements_lock = "//a:requirements.txt",
+)
+use_repo(pip, "pip_A")
+
+types = use_extension("@rules_mypy//mypy:types.bzl", "types")
+types.requirements(
+    name = "pip_A_types",
+    pip_requirements = "@pip_A//:requirements.bzl",
+    requirements_txt = "//a:requirements.txt",
+)
+use_repo(types, "pip_A_types")

examples/multi-version/README.md

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+Test case for using different Python versions:
+https://github.com/theoremlp/rules_mypy/issues/87

examples/multi-version/a/BUILD.bazel

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+load("@rules_python//python:py_binary.bzl", "py_binary")
+load("@rules_uv//uv:pip.bzl", "pip_compile")
+
+pip_compile(
+    name = "generate_requirements_lock",
+    requirements_in = "requirements.in",
+    requirements_txt = "requirements.txt",
+)
+
+py_binary(
+    name = "a",
+    srcs = ["a.py"],
+    tags = ["typecheck_A"],
+    python_version = "3.10",
+)

examples/multi-version/a/requirements.in

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+cachetools
+types-cachetools

examples/multi-version/a/requirements.txt

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+# This file was autogenerated by uv via the following command:
+#    bazel run @@//a:generate_requirements_lock
+--index-url https://pypi.org/simple
+
+cachetools==6.0.0 \
+    --hash=sha256:82e73ba88f7b30228b5507dce1a1f878498fc669d972aef2dde4f3a3c24f103e \
+    --hash=sha256:f225782b84438f828328fc2ad74346522f27e5b1440f4e9fd18b20ebfd1aa2cf
+    # via -r a/requirements.in
+types-cachetools==6.0.0.20250525 \
+    --hash=sha256:1de8f0fe4bdcb187a48d2026c1e3672830f67943ad2bf3486abe031b632f1252 \
+    --hash=sha256:baf06f234cac3aeb44c07893447ba03ecdb6c0742ba2607e28a35d38e6821b02
+    # via -r a/requirements.in

examples/multi-version/b/BUILD.bazel

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+load("@rules_python//python:py_binary.bzl", "py_binary")
+load("@rules_uv//uv:pip.bzl", "pip_compile")
+
+py_binary(
+    name = "b",
+    srcs = ["b.py"],
+    python_version = "3.11",
+)

examples/multi-version/b/requirements.txt

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+# This file was autogenerated by uv via the following command:
+#    bazel run @@//:generate_requirements_lock
+--index-url https://pypi.org/simple
+

examples/multi-version/py.bzl

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+"Custom py_library rule that also runs mypy."
+
+load("@pip_A_types//:types.bzl", "types")
+load("@rules_mypy//mypy:mypy.bzl", "mypy")
+
+mypy_aspect = mypy(
+    opt_in_tags = ["typecheck_A"],
+    types = types,
+)