Drop Python 3.7 support

Author: sdhiscocks

.circleci/config.yml

@@ -3,7 +3,6 @@ workflows:
   version: 2
   test:
     jobs:
-      - test-37
       - test-38
       - test-39
       - test-310
@@ -12,9 +11,9 @@ workflows:
     jobs:
       - docs
 jobs:
-  test-37: &test-template
+  test-38: &test-template
     docker:
-      - image: cimg/python:3.7
+      - image: cimg/python:3.8
     steps:
       - checkout
       - restore_cache:
@@ -47,10 +46,6 @@ jobs:
               -f test-reports/coverage.xml \
               -F unittests \
               -n ${CIRCLE_BUILD_NUM}
-  test-38:
-    <<: *test-template
-    docker:
-      - image: cimg/python:3.8
   test-39:
     <<: *test-template
     docker:

README.md

@@ -29,7 +29,7 @@ Stone Soup uses the following dependencies:
 
 | Name | License |
 | ---- | ------- |
-| [Python](https://www.python.org/) (v3.7+) | PSFL |
+| [Python](https://www.python.org/) (v3.8+) | PSFL |
 | [numpy](https://numpy.org/) | BSD |
 | [SciPy](https://www.scipy.org/) | BSD |
 | [matplotlib](https://matplotlib.org/) | [PSF/BSD-compatible](https://matplotlib.org/users/license.html) |

setup.cfg

@@ -16,7 +16,7 @@ classifiers =
     Topic :: Scientific/Engineering
 
 [options]
-python_requires = >=3.7
+python_requires = >=3.8
 packages = find:
 install_requires =
     matplotlib

stonesoup/_util.py

@@ -59,10 +59,9 @@ def __init__(self, foo, bar=bar.default, *args, **kwargs):
 from abc import ABCMeta
 from collections import OrderedDict
 from copy import copy
+from functools import cached_property
 from types import MappingProxyType
 
-from ._util import cached_property
-
 
 class Property:
     """Property(cls, default=inspect.Parameter.empty)