build: explicitly require Python 3.7+ (tensorflow#5878)

* build: explicitly require Python 3.7+

Contributes to tensorflow#5725

* Run flake8 for all targeted python versions

.github/workflows/ci.yml

@@ -214,7 +214,7 @@ jobs:
         # flake8 should run on each Python version that we target,
         # because the errors and warnings can differ due to language
         # changes, and we want to catch them all.
-        python_version: ['3.6', '3.7']
+        python_version: ['3.7', '3.8', '3.9', '3.10']
     steps:
       - uses: actions/checkout@50fbc622fc4ef5163becd7fab6573eac35f8462e
       - uses: actions/setup-python@152ba7c4dd6521b8e9c93f72d362ce03bf6c4f20

tensorboard/data/server/pip_package/setup.py

@@ -32,7 +32,7 @@
             "bin/*",
         ],
     },
-    python_requires=">=3.6",
+    python_requires=">=3.7",
     install_requires=[],
     tests_require=[],
     # PyPI package information. <https://pypi.org/classifiers/>
@@ -43,9 +43,10 @@
         "Intended Audience :: Science/Research",
         "License :: OSI Approved :: Apache Software License",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
+        "Programming Language :: Python :: 3.10",
         "Programming Language :: Rust",
         "Topic :: Scientific/Engineering :: Mathematics",
         "Topic :: Software Development :: Libraries :: Python Modules",

tensorboard/pip_package/setup.py

@@ -64,7 +64,7 @@ def get_readme():
     },
     install_requires=REQUIRED_PACKAGES,
     tests_require=REQUIRED_PACKAGES,
-    python_requires=">=3.6",
+    python_requires=">=3.7",
     # PyPI package information.
     classifiers=[
         "Development Status :: 4 - Beta",
@@ -73,10 +73,10 @@ def get_readme():
         "Intended Audience :: Science/Research",
         "License :: OSI Approved :: Apache Software License",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
+        "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3 :: Only",
         "Topic :: Scientific/Engineering :: Mathematics",
         "Topic :: Software Development :: Libraries :: Python Modules",