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

2025-08-22 09:45:06 +00:00 · 2021-07-30 13:10:37 -04:00 · 2021-07-30 13:10:37 -04:00 · ceea579ccc
commit ceea579ccc
parent e3f877c32d
4 changed files with 56 additions and 8 deletions
--- 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])