1 files changed, 20 insertions, 0 deletions
diff --git a/chapter/6/resources/code/counters/python/operation-based-increment-and-decrement-counter.py b/chapter/6/resources/code/counters/python/operation-based-increment-and-decrement-counter.py
new file mode 100644
index 0000000..5182ab1
--- /dev/null
+++ b/chapter/6/resources/code/counters/python/operation-based-increment-and-decrement-counter.py
@@ -0,0 +1,20 @@
+class CmRDT:
+    pass
+
+class Counter(CmRDT):
+
+    def __init__(self):         # constructor function
+        self._count = 0
+
+    def value(self):            # query function
+        return self._count
+
+    def increment(self):        # update function
+        self._count += 1
+        for replica in self.replicas():
+            self.transmit("increment", replica)
+
+    def decrement(self):        # update function
+        self._count -= 1
+        for replica in self.replicas():
+            self.transmit("decrement", replica)