diff --git a/doc/case-insensitive-lexing.md b/doc/case-insensitive-lexing.md
index 879372eed..4c4248438 100644
--- a/doc/case-insensitive-lexing.md
+++ b/doc/case-insensitive-lexing.md
@@ -76,3 +76,4 @@ Here are implementations of `CaseChangingCharStream` in various target languages
 * [Go](https://github.com/antlr/antlr4/blob/master/doc/resources/case_changing_stream.go)
 * [Java](https://github.com/antlr/antlr4/blob/master/doc/resources/CaseChangingCharStream.java)
 * [JavaScript](https://github.com/antlr/antlr4/blob/master/doc/resources/CaseChangingStream.js)
+* [Python2/3](https://github.com/antlr/antlr4/blob/master/doc/resources/CaseChangingStream.py)
diff --git a/doc/resources/CaseChangingStream.py b/doc/resources/CaseChangingStream.py
new file mode 100644
index 000000000..6d2815de4
--- /dev/null
+++ b/doc/resources/CaseChangingStream.py
@@ -0,0 +1,13 @@
+class CaseChangingStream():
+	def __init__(self, stream, upper):
+		self._stream = stream
+		self._upper = upper
+
+	def __getattr__(self, name):
+		return self._stream.__getattribute__(name)
+
+	def LA(self, offset):
+		c = self._stream.LA(offset)
+		if c <= 0:
+			return c
+		return ord(chr(c).upper() if self._upper else chr(c).lower())