bump python 3.9+

Author: Borda

.github/workflows/_legacy-checkpoints.yml

@@ -60,7 +60,7 @@ jobs:
       - uses: actions/setup-python@v5
         with:
           # Python version here needs to be supported by all PL versions listed in back-compatible-versions.txt.
-          python-version: 3.8
+          python-version: "3.9"
 
       - name: Install PL from source
         env:

docs/source-pytorch/accelerators/tpu_faq.rst

@@ -40,9 +40,9 @@ Unsupported datatype transfer to TPUs?
 
 .. code-block::
 
-    File "/usr/local/lib/python3.8/dist-packages/torch_xla/utils/utils.py", line 205, in _for_each_instance_rewrite
+    File "/usr/local/lib/python3.9/dist-packages/torch_xla/utils/utils.py", line 205, in _for_each_instance_rewrite
         v = _for_each_instance_rewrite(result.__dict__[k], select_fn, fn, rwmap)
-    File "/usr/local/lib/python3.8/dist-packages/torch_xla/utils/utils.py", line 206, in _for_each_instance_rewrite
+    File "/usr/local/lib/python3.9/dist-packages/torch_xla/utils/utils.py", line 206, in _for_each_instance_rewrite
         result.__dict__[k] = v
     TypeError: 'mappingproxy' object does not support item assignment
 

docs/source-pytorch/advanced/post_training_quantization.rst

@@ -33,7 +33,7 @@ Installation
 Prerequisites
 =============
 
-Python version: 3.8, 3.9, 3.10
+Python version: 3.9, 3.10
 
 Install Intel® Neural Compressor
 ================================

pyproject.toml

@@ -44,7 +44,7 @@ ignore-words-list = "te, compiletime"
 
 [tool.ruff]
 line-length = 120
-target-version = "py38"
+target-version = "py39"
 # Exclude a variety of commonly ignored directories.
 exclude = [
     ".git",

src/lightning_fabric/__setup__.py

@@ -73,7 +73,7 @@ def _setup_args() -> Dict[str, Any]:
         "include_package_data": True,
         "zip_safe": False,
         "keywords": ["deep learning", "pytorch", "AI"],
-        "python_requires": ">=3.8",
+        "python_requires": ">=3.9",
         "setup_requires": ["wheel"],
         "install_requires": assistant.load_requirements(
             _PATH_REQUIREMENTS, unfreeze="none" if _FREEZE_REQUIREMENTS else "all"
@@ -105,7 +105,6 @@ def _setup_args() -> Dict[str, Any]:
             # Specify the Python versions you support here. In particular, ensure
             # that you indicate whether you support Python 2, Python 3 or both.
             "Programming Language :: Python :: 3",
-            "Programming Language :: Python :: 3.8",
             "Programming Language :: Python :: 3.9",
             "Programming Language :: Python :: 3.10",
             "Programming Language :: Python :: 3.11",

src/pytorch_lightning/__setup__.py

@@ -80,7 +80,7 @@ def _setup_args() -> Dict[str, Any]:
         "long_description_content_type": "text/markdown",
         "zip_safe": False,
         "keywords": ["deep learning", "pytorch", "AI"],
-        "python_requires": ">=3.8",
+        "python_requires": ">=3.9",
         "setup_requires": ["wheel"],
         # TODO: aggregate pytorch and lite requirements as we include its source code directly in this package.
         # this is not a problem yet because lite's base requirements are all included in pytorch's base requirements
@@ -107,7 +107,6 @@ def _setup_args() -> Dict[str, Any]:
             "Operating System :: OS Independent",
             # Specify the Python versions you support here.
             "Programming Language :: Python :: 3",
-            "Programming Language :: Python :: 3.8",
             "Programming Language :: Python :: 3.9",
             "Programming Language :: Python :: 3.10",
             "Programming Language :: Python :: 3.11",