ShawnMilo · December 3, 2013 20:55 · Dec 3, 2013
diff --git a/validate_uuid4.py b/validate_uuid4.py
@@ -0,0 +1,40 @@
+from uuid import UUID
+
+def validate_uuid4(uuid_string):
+
+    """
+    Validate that a UUID string is in
+    fact a valid uuid4.
+
+    Happily, the uuid module does the actual
+    checking for us.
+
+    It is vital that the 'version' kwarg be passed
+    to the UUID() call, otherwise any 32-character
+    hex string is considered valid.
+    """
+
+    try:
+        val = UUID(uuid_string, version=4)
+    except ValueError:
+        # If it's a value error, then the string 
+        # is not a valid hex code for a UUID.
+        return False
+
+    # If the uuid_string is a valid hex code, 
+    # but an invalid uuid4,
+    # the UUID.__init__ will convert it to a 
+    # valid uuid4. This is bad for validation purposes.
+
+    return val.hex == uuid_string
+
+if __name__ == '__main__':
+
+    # Valid uuid, generated by uuid4():
+    x = '89eb35868a8247a4a911758a62601cf7'
+    print validate_uuid4(x)
+
+    # Same as above, except for the 17th charecter
+    # which is a valid hex string, but not a valid uuid4.
+    x = '89eb35868a8247a4c911758a62601cf7'
+    print validate_uuid4(x)
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