3535 - drop python 36 support

.github/workflows/pythonapp-gpu.yml

@@ -20,30 +20,31 @@ jobs:
       matrix:
         environment:
           - "PT17+CUDA102"
-          - "PT17+CUDA110"
           - "PT18+CUDA102"
+          - "PT18+CUDA112"
           - "PT19+CUDA114"
           - "PT110+CUDA115"
           - "PT110+CUDA102"
         include:
+          # https://docs.nvidia.com/deeplearning/frameworks/pytorch-release-notes
           - environment: PT17+CUDA102
             pytorch: "torch==1.7.1 torchvision==0.8.2"
             base: "nvcr.io/nvidia/cuda:10.2-devel-ubuntu18.04"
-          - environment: PT17+CUDA110
-            # we explicitly set pytorch to -h to avoid pip install error
-            pytorch: "-h"
-            base: "nvcr.io/nvidia/pytorch:20.09-py3"
           - environment: PT18+CUDA102
             pytorch: "torch==1.8.1 torchvision==0.9.1"
             base: "nvcr.io/nvidia/cuda:10.2-devel-ubuntu18.04"
+          - environment: PT18+CUDA112
+            # we explicitly set pytorch to -h to avoid pip install error
+            # 21.03: 1.9.0a0+df837d0
+            pytorch: "-h"
+            base: "nvcr.io/nvidia/pytorch:21.03-py3"
           - environment: PT19+CUDA114
             # we explicitly set pytorch to -h to avoid pip install error
             # 21.10: 1.10.0a0+0aef44c
             pytorch: "-h"
             base: "nvcr.io/nvidia/pytorch:21.10-py3"
           - environment: PT110+CUDA115
             # we explicitly set pytorch to -h to avoid pip install error
-            # https://docs.nvidia.com/deeplearning/frameworks/pytorch-release-notes
             # 21.12: 1.11.0a0+b6df043
             pytorch: "-h"
             base: "nvcr.io/nvidia/pytorch:21.12-py3"
@@ -62,7 +63,7 @@ jobs:
           [ ${{ matrix.environment }} = "PT18+CUDA102" ] || \
           [ ${{ matrix.environment }} = "PT110+CUDA102" ]
         then
-        PYVER=3.6 PYSFX=3 DISTUTILS=python3-distutils && \
+        PYVER=3.7 PYSFX=3 DISTUTILS=python3-distutils && \
         apt-get update && apt-get install -y --no-install-recommends \
           curl \
           pkg-config \

.github/workflows/pythonapp-min.yml

@@ -74,7 +74,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9]
+        python-version: [3.7, 3.8, 3.9]
     timeout-minutes: 40
     steps:
     - uses: actions/checkout@v2

.github/workflows/release.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9]
+        python-version: [3.7, 3.8, 3.9]
     steps:
     - uses: actions/checkout@v2
       with:

.github/workflows/setupapp.yml

@@ -74,7 +74,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9]
+        python-version: [3.7, 3.8, 3.9]
     steps:
     - uses: actions/checkout@v2
       with:

.pre-commit-config.yaml

@@ -26,7 +26,7 @@ repos:
     rev: v2.29.0
     hooks:
       - id: pyupgrade
-        args: [--py36-plus]
+        args: [--py37-plus]
         name: Upgrade code
         exclude: |
           (?x)^(

CONTRIBUTING.md

@@ -113,7 +113,7 @@ or (for new features that would not break existing functionality):
 ```
 
 It is recommended that the new test `test_[module_name].py` is constructed by using only
-python 3.6+ build-in functions, `torch`, `numpy`, `coverage` (for reporting code coverages) and `parameterized` (for organising test cases) packages.
+python 3.7+ build-in functions, `torch`, `numpy`, `coverage` (for reporting code coverages) and `parameterized` (for organising test cases) packages.
 If it requires any other external packages, please make sure:
 - the packages are listed in [`requirements-dev.txt`](requirements-dev.txt)
 - the new test `test_[module_name].py` is added to the `exclude_cases` in [`./tests/min_tests.py`](./tests/min_tests.py) so that
@@ -228,7 +228,7 @@ Notably,
 for example, ``import monai.transforms.Spacing`` is the equivalent of ``monai.transforms.spatial.array.Spacing`` if
 ``class Spacing`` defined in file `monai/transforms/spatial/array.py` is decorated with ``@export("monai.transforms")``.
 
-For string definition, [f-string](https://www.python.org/dev/peps/pep-0498/) is recommended to use over `%-print` and `format-print` from python 3.6. So please try to use `f-string` if you need to define any string object.
+For string definition, [f-string](https://www.python.org/dev/peps/pep-0498/) is recommended to use over `%-print` and `format-print`. So please try to use `f-string` if you need to define any string object.
 
 #### Backwards compatibility
 MONAI is currently under active development, and with major version zero (following the [Semantic Versioning](https://semver.org/)).

docs/source/conf.py

@@ -22,7 +22,7 @@
 
 # -- Project information -----------------------------------------------------
 project = "MONAI"
-copyright = "2020 - 2021 MONAI Consortium"
+copyright = "MONAI Consortium"
 author = "MONAI Contributors"
 
 # The full version, including alpha/beta/rc tags

docs/source/installation.md

@@ -14,7 +14,7 @@
 
 ---
 
-MONAI's core functionality is written in Python 3 (>= 3.6) and only requires [Numpy](https://numpy.org/) and [Pytorch](https://pytorch.org/).
+MONAI's core functionality is written in Python 3 (>= 3.7) and only requires [Numpy](https://numpy.org/) and [Pytorch](https://pytorch.org/).
 
 The package is currently distributed via Github as the primary source code repository,
 and the Python package index (PyPI). The pre-built Docker images are made available on DockerHub.

monai/__init__.py

@@ -15,22 +15,24 @@
 from ._version import get_versions
 
 PY_REQUIRED_MAJOR = 3
-PY_REQUIRED_MINOR = 6
+PY_REQUIRED_MINOR = 7
 
 version_dict = get_versions()
 __version__: str = version_dict.get("version", "0+unknown")
 __revision_id__: str = version_dict.get("full-revisionid")
 del get_versions, version_dict
 
-__copyright__ = "(c) 2020 - 2021 MONAI Consortium"
+__copyright__ = "(c) MONAI Consortium"
 
 __basedir__ = os.path.dirname(__file__)
 
 if sys.version_info.major != PY_REQUIRED_MAJOR or sys.version_info.minor < PY_REQUIRED_MINOR:
-    raise RuntimeError(
-        "MONAI requires Python {}.{} or higher. But the current Python is: {}".format(
-            PY_REQUIRED_MAJOR, PY_REQUIRED_MINOR, sys.version
-        )
+    import warnings
+
+    warnings.warn(
+        f"MONAI requires Python {PY_REQUIRED_MAJOR}.{PY_REQUIRED_MINOR} or higher. "
+        f"But the current Python is: {sys.version}",
+        category=RuntimeWarning,
     )
 
 from .utils.module import load_submodules  # noqa: E402

monai/data/torchscript_utils.py

@@ -1,4 +1,4 @@
-# Copyright 2020 - 2021 MONAI Consortium
+# Copyright (c) MONAI Consortium
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at

pyproject.toml

@@ -8,7 +8,7 @@ requires = [
 
 [tool.black]
 line-length = 120
-target-version = ['py36', 'py37', 'py38']
+target-version = ['py37', 'py38', 'py39']
 include = '\.pyi?$'
 exclude = '''
 (

setup.cfg

@@ -16,7 +16,7 @@ project_urls =
     Source Code=https://github.com/Project-MONAI/MONAI
 
 [options]
-python_requires = >= 3.6
+python_requires = >= 3.7
 # for compiling and develop setup only
 # no need to specify the versions so that we could
 # compile for multiple targeted versions.

tests/test_torchscript_utils.py

@@ -1,4 +1,4 @@
-# Copyright 2020 - 2021 MONAI Consortium
+# Copyright (c) MONAI Consortium
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at