flake8 fixes

Author: kshedden

doc/source/whatsnew/v0.18.1.txt

@@ -248,7 +248,7 @@ Deprecations
 Performance Improvements
 ~~~~~~~~~~~~~~~~~~~~~~~~
 
-- Improved speed of SAS reader (PR 12656)
+- Improved speed of SAS reader (:issue:`12656`)
 
 - Improved performance of ``DataFrame.to_sql`` when checking case sensitivity for tables. Now only checks if table has been created correctly when table name is not lower case. (:issue:`12876`)
 

pandas/io/sas/sas7bdat.py

@@ -413,7 +413,6 @@ def _process_columntext_subheader(self, offset, length):
         self.column_names_strings.append(cname)
 
         if len(self.column_names_strings) == 1:
-            column_name = self.column_names_strings[0]
             compression_literal = ""
             for cl in const.compression_literals:
                 if cl in cname_raw:

pandas/io/sas/sas_constants.py

@@ -101,6 +101,7 @@
 encoding_names = {29: "latin1", 20: "utf-8", 33: "cyrillic", 60: "wlatin2",
                   61: "wcyrillic", 62: "wlatin1", 90: "ebcdic870"}
 
+
 class index:
     rowSizeIndex = 0
     columnSizeIndex = 1

pandas/io/tests/sas/test_sas7bdat.py

@@ -103,6 +103,7 @@ def test_12659():
     df0 = df0.astype(np.float64)
     tm.assert_frame_equal(df, df0)
 
+
 def test_airline():
     dirpath = tm.get_data_path()
     fname = os.path.join(dirpath, "airline.sas7bdat")