bpo-43625: Enhance csv sniffer has_headers() to be more accurate (GH-26939)

1 files changed, 4 insertions, 8 deletions

diff --git a/Lib/csv.py b/Lib/csv.py
index dc85077f3e..bb3ee269ae 100644
--- a/Lib/csv.py
+++ b/Lib/csv.py
@@ -409,14 +409,10 @@ class Sniffer:
                 continue # skip rows that have irregular number of columns
 
             for col in list(columnTypes.keys()):
-
-                for thisType in [int, float, complex]:
-                    try:
-                        thisType(row[col])
-                        break
-                    except (ValueError, OverflowError):
-                        pass
-                else:
+                thisType = complex
+                try:
+                    thisType(row[col])
+                except (ValueError, OverflowError):
                     # fallback to length of string
                     thisType = len(row[col])