commit 440c9f772a9b66c1ea387c1c3efc9ff438880acf
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Fri Jul 30 10:30:09 2021 -0700
committer GitHub <noreply@github.com> Fri Jul 30 19:30:09 2021 +0200
tree b0383b5f00c3c76663c7947a2ce9d842d1b42aea
parent 6f950023c6a2168b229363d75f59a24ecdd66d19

bpo-43625: Enhance csv sniffer has_headers() to be more accurate (GH-26939) (GH-27494)

(cherry picked from commit ceea579ccc51791f3e115155d6f27905bc7544a9)

Co-authored-by: andrei kulakov <andrei.avk@gmail.com>

Lib/csv.py

diff --git a/Lib/csv.py b/Lib/csv.py
index dc85077..bb3ee26 100644
--- a/Lib/csv.py
+++ b/Lib/csv.py
@@ -409,14 +409,10 @@ def has_header(self, sample):
                 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])