1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/csv.py b/Lib/csv.py
index 758c79a..cd0f7d3 100644
--- a/Lib/csv.py
+++ b/Lib/csv.py
@@ -253,7 +253,7 @@ class Sniffer:
         additional chunks as necessary.
         """
 
-        data = filter(None, data.split('\n'))
+        data = list(filter(None, data.split('\n')))
 
         ascii = [chr(c) for c in range(127)] # 7-bit ASCII