Put some code back again.

Author: makeajourney

pandas/io/parsers.py

@@ -3569,7 +3569,7 @@ def get_rows(self, infer_nrows, skiprows=None):
     def detect_colspecs(self, infer_nrows=100, skiprows=None):
         # Regex escape the delimiters
         delimiters = ''.join(r'\{}'.format(x) for x in self.delimiter)
-        pattern = re.compile('([^{}]+)'.format(delimiters))
+        pattern = re.compile('([^%s]+)' % delimiters)
         rows = self.get_rows(infer_nrows, skiprows)
         if not rows:
             raise EmptyDataError("No rows from which to infer column width")