CLN: pep8 fix

Author: deflatSOCO

pandas/tests/io/formats/test_to_csv.py

@@ -307,7 +307,7 @@ def test_to_csv_string_with_lf(self):
                 assert f.read() == expected_bin
 
             # 'line_terminator' should not change inner element
-            expected_bin =(
+            expected_bin = (
                 b'int,str_lf\r\n'
                 b'1,abc\r\n'
                 b'2,"d\nef"\r\n'