Fix file descriptor leak

Author: roberthdevries

pandas/io/parsers.py

@@ -2273,11 +2273,15 @@ def __init__(self, f, **kwds):
         # Get columns in two steps: infer from data, then
         # infer column indices from self.usecols if it is specified.
         self._col_indices = None
-        (
-            self.columns,
-            self.num_original_columns,
-            self.unnamed_cols,
-        ) = self._infer_columns()
+        try:
+            (
+                self.columns,
+                self.num_original_columns,
+                self.unnamed_cols,
+            ) = self._infer_columns()
+        except EmptyDataError:
+            self.close()
+            raise
 
         # Now self.columns has the set of columns that we will process.
         # The original set is stored in self.original_columns.

pandas/tests/io/parser/test_python_parser_only.py

@@ -10,11 +10,13 @@
 
 import pytest
 
-from pandas.errors import ParserError
+from pandas.errors import ParserError, EmptyDataError
 
 from pandas import DataFrame, Index, MultiIndex
 import pandas._testing as tm
 
+import psutil
+
 
 def test_default_separator(python_parser_only):
     # see gh-17333
@@ -314,3 +316,15 @@ def test_malformed_skipfooter(python_parser_only):
     msg = "Expected 3 fields in line 4, saw 5"
     with pytest.raises(ParserError, match=msg):
         parser.read_csv(StringIO(data), header=1, comment="#", skipfooter=1)
+
+
+def test_file_descriptor_leak(python_parser_only):
+    # GH 31488
+    parser = python_parser_only
+    with open("empty.csv", "w"):
+        pass
+
+    proc = psutil.Process()
+    with pytest.raises(EmptyDataError):
+        parser.read_csv("empty.csv")
+    assert not proc.open_files()