Drop support for Python 3.7

.github/workflows/_test.yml

@@ -37,7 +37,7 @@ jobs:
       # (sslib main) on Linux/Python3.x only.
       matrix:
         toxenv: [py]
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.8", "3.9", "3.10", "3.11"]
         os: [ubuntu-latest, macos-latest, windows-latest]
         include:
           - python-version: 3.x

pyproject.toml

@@ -8,7 +8,7 @@ name = "tuf"
 description = "A secure updater framework for Python"
 readme = "README.md"
 license = { text = "MIT OR Apache-2.0" }
-requires-python = ">=3.7"
+requires-python = ">=3.8"
 authors = [
   { email = "[email protected]" },
 ]
@@ -33,7 +33,6 @@ classifiers = [
   "Operating System :: POSIX :: Linux",
   "Programming Language :: Python",
   "Programming Language :: Python :: 3",
-  "Programming Language :: Python :: 3.7",
   "Programming Language :: Python :: 3.8",
   "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",

requirements/main.txt

@@ -26,7 +26,7 @@
 # 1. Use this script to create a pinned requirements file for each Python
 #    version
 # ```
-# for v in 3.7 3.8 3.9 3.10 3.11; do
+# for v in 3.8 3.9 3.10 3.11; do
 #   mkvirtualenv tuf-env-${v} -p python${v};
 #   python3 -m pip install pip-tools;
 #   pip-compile --no-header -o requirements-${v}.txt main.txt;

tests/test_metadata_eq_.py

@@ -113,8 +113,7 @@ def test_md_eq_signatures_reversed_order(self) -> None:
         md.signatures = {"a": Signature("a", "a"), "b": Signature("b", "b")}
         md_2 = copy.deepcopy(md)
         # Reverse signatures order in md_2.
-        # In python3.7 we need to cast to a list and then reverse.
-        md_2.signatures = dict(reversed(list(md_2.signatures.items())))
+        md_2.signatures = dict(reversed(md_2.signatures.items()))
         # Assert that both objects are not the same because of signatures order.
         self.assertNotEqual(md, md_2)
 
@@ -168,9 +167,8 @@ def test_delegations_eq_roles_reversed_order(self) -> None:
 
         # Create a second delegations obj with reversed roles order
         delegations_2 = copy.deepcopy(delegations)
-        # In python3.7 we need to cast to a list and then reverse.
         assert isinstance(delegations.roles, dict)
-        delegations_2.roles = dict(reversed(list(delegations.roles.items())))
+        delegations_2.roles = dict(reversed(delegations.roles.items()))
 
         # Both objects are not the equal because of delegated roles order.
         self.assertNotEqual(delegations, delegations_2)