fix total method on counters, remove deptry

Makefile

@@ -11,8 +11,6 @@ check: ## Run code quality tools.
 	@poetry lock --check
 	@echo "🚀 Linting code: Running pre-commit"
 	@poetry run pre-commit run -a
-	@echo "🚀 Checking for obsolete dependencies: Running deptry"
-	@poetry run deptry .
 
 .PHONY: test
 test: ## Test the code with pytest

json_explorer/explore.py

@@ -29,6 +29,20 @@ def oxford_join(items, pluralize=False):
     return "{}, or {}".format(", ".join(items[:-1]), items[-1])
 
 
+class Counter(collections.Counter):
+    """The 'total' method is only available on a collections.Counter
+    in python >= 3.10, so add the method to be compatible with earlier
+    versions.
+
+    """
+
+    def total(self):
+        try:
+            return super().total()
+        except AttributeError:
+            return sum(self.values())
+
+
 class TripleCounter(dict):
     def increment(self, keys, amount):
         try:
@@ -40,13 +54,13 @@ def increment(self, keys, amount):
         if a not in self:
             self[a] = {}
         if b not in self[a]:
-            self[a][b] = collections.Counter()
+            self[a][b] = Counter()
         self[a][b][c] += amount
 
     def tree(self):
         result = {}
         for a, sub_dict in self.items():
-            sub_counter = collections.Counter()
+            sub_counter = Counter()
             for b, c_counter in sub_dict.items():
                 sub_counter[b] += c_counter.total()
 

pyproject.toml

@@ -14,12 +14,11 @@ packages = [
 greet = "json_explorer.explore:main"
 
 [tool.poetry.dependencies]
-python = ">=3.8,<4.0"
+python = ">=3.7,<4.0"
 
 [tool.poetry.group.dev.dependencies]
 pytest = "^7.2.0"
 pytest-cov = "^4.0.0"
-deptry = "^0.6.4"
 pre-commit = "^2.20.0"
 tox = "^3.25.1"
 beautifulsoup4 = "^4.12.2"

tox.ini

@@ -1,9 +1,10 @@
 [tox]
 skipsdist = true
-envlist = py38, py39, py310, py311
+envlist = py37, py38, py39, py310, py311
 
 [gh-actions]
 python =
+    3.7: py37
     3.8: py38
     3.9: py39
     3.10: py310