Drop support for running with Python 3.7

Fixes #15056

Author: hauntsaninja

.github/workflows/test.yml

@@ -26,37 +26,26 @@ jobs:
       fail-fast: false
       matrix:
         include:
-        - name: Test suite with py37-windows-64
-          python: '3.7'
-          arch: x64
-          os: windows-latest
-          toxenv: py37
-        - name: Test suite with py38-ubuntu
+        # Make sure to run mypyc compiled unit tests for both
+        # the oldest and newest supported Python versions
+        - name: Test suite with py38-ubuntu, mypyc-compiled
           python: '3.8'
           arch: x64
           os: ubuntu-latest
           toxenv: py
           tox_extra_args: "-n 2"
+          test_mypyc: true
+        - name: Test suite with py38-windows-64
+          python: '3.8'
+          arch: x64
+          os: windows-latest
+          toxenv: py38
         - name: Test suite with py39-ubuntu
           python: '3.9'
           arch: x64
           os: ubuntu-latest
           toxenv: py
           tox_extra_args: "-n 2"
-        - name: Test suite with py37-ubuntu, mypyc-compiled
-          python: '3.7'
-          arch: x64
-          os: ubuntu-latest
-          toxenv: py
-          tox_extra_args: "-n 2"
-          test_mypyc: true
-        - name: Test suite with py310-ubuntu, mypyc-compiled
-          python: '3.10'
-          arch: x64
-          os: ubuntu-latest
-          toxenv: py
-          tox_extra_args: "-n 2"
-          test_mypyc: true
         - name: Test suite with py310-ubuntu
           python: '3.10'
           arch: x64
@@ -70,29 +59,32 @@ jobs:
           toxenv: py
           tox_extra_args: "-n 2"
           test_mypyc: true
-        - name: mypyc runtime tests with py37-macos
-          python: '3.7'
+
+        - name: mypyc runtime tests with py38-macos
+          python: '3.8.17'
           arch: x64
           os: macos-latest
           toxenv: py
           tox_extra_args: "-n 2 mypyc/test/test_run.py mypyc/test/test_external.py"
-        - name: mypyc runtime tests with py37-debug-build-ubuntu
-          python: '3.7.13'
+        - name: mypyc runtime tests with py38-debug-build-ubuntu
+          python: '3.8'
           arch: x64
           os: ubuntu-latest
           toxenv: py
           tox_extra_args: "-n 2 mypyc/test/test_run.py mypyc/test/test_external.py"
           debug_build: true
-        - name: Type check our own code (py37-ubuntu)
-          python: '3.7'
+
+        - name: Type check our own code (py38-ubuntu)
+          python: '3.8'
           arch: x64
           os: ubuntu-latest
           toxenv: type
-        - name: Type check our own code (py37-windows-64)
-          python: '3.7'
+        - name: Type check our own code (py38-windows-64)
+          python: '3.8'
           arch: x64
           os: windows-latest
           toxenv: type
+
           # We also run these checks with pre-commit in CI,
           # but it's useful to run them with tox too,
           # to ensure the tox env works as expected

mypy/defaults.py

@@ -8,7 +8,7 @@
 # Earliest fully supported Python 3.x version. Used as the default Python
 # version in tests. Mypy wheels should be built starting with this version,
 # and CI tests should be run on this version (and later versions).
-PYTHON3_VERSION: Final = (3, 7)
+PYTHON3_VERSION: Final = (3, 8)
 
 # Earliest Python 3.x version supported via --python-version 3.x. To run
 # mypy, at least version PYTHON3_VERSION is needed.

mypy/dmypy_server.py

@@ -896,8 +896,6 @@ def cmd_inspect(
         force_reload: bool = False,
     ) -> dict[str, object]:
         """Locate and inspect expression(s)."""
-        if sys.version_info < (3, 8):
-            return {"error": 'Python 3.8 required for "inspect" command'}
         if not self.fine_grained_manager:
             return {
                 "error": 'Command "inspect" is only valid after a "check" command'