Add issue number

Author: evanpw

doc/source/whatsnew/v0.17.0.txt

@@ -61,7 +61,7 @@ Bug Fixes
 ~~~~~~~~~
 
 - Bug in ``Categorical`` repr with ``display.width`` of ``None`` in Python 3 (:issue:`10087`)
-- Bug causing strings containing an exponent but no decimal to be parsed as ints instead of floats in python csv parser. (:issue:`?????`)
+- Bug causing strings containing an exponent but no decimal to be parsed as ints instead of floats in python csv parser. (:issue:`9565`)
 
 
 - Bug in ``Timestamp``'s' ``microsecond``, ``quarter``, ``dayofyear``, ``week`` and ``daysinmonth`` properties return ``np.int`` type, not built-in ``int``. (:issue:`10050`)

pandas/io/tests/test_parsers.py

@@ -2294,7 +2294,7 @@ def test_chunk_begins_with_newline_whitespace(self):
         self.assertEqual(len(result), 2)
 
     def test_float_parser(self):
-        # GH ?????
+        # GH 9565
         data = '45e-1,4.5,45.,inf,-inf'
         result = self.read_csv(StringIO(data), header=None)
         expected = pd.DataFrame([[float(s) for s in data.split(',')]])