BUG: Error while saving DataFrame with TimedeltaIndex to .csv #10833

Author: Egor Panfilov

pandas/core/format.py

@@ -2174,7 +2174,7 @@ def __init__(self, values, nat_rep='NaT', box=False, **kwargs):
     def _format_strings(self):
         formatter = self.formatter or _get_format_timedelta64(self.values, nat_rep=self.nat_rep,
                                                               box=self.box)
-        fmt_values = [formatter(x) for x in self.values]
+        fmt_values = np.array([formatter(x) for x in self.values])
         return fmt_values