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-rw-r--r--Lib/csv.py4
1 files changed, 2 insertions, 2 deletions
diff --git a/Lib/csv.py b/Lib/csv.py
index 0349e0bd11..6a8587674f 100644
--- a/Lib/csv.py
+++ b/Lib/csv.py
@@ -307,7 +307,7 @@ class Sniffer:
charFrequency = {}
modes = {}
delims = {}
- start, end = 0, min(chunkLength, len(data))
+ start, end = 0, chunkLength
while start < len(data):
iteration += 1
for line in data[start:end]:
@@ -336,7 +336,7 @@ class Sniffer:
# build a list of possible delimiters
modeList = modes.items()
- total = float(chunkLength * iteration)
+ total = float(min(chunkLength * iteration, len(data)))
# (rows of consistent data) / (number of rows) = 100%
consistency = 1.0
# minimum consistency threshold