Fix BOM for Python 3 too, add changelog entry

Author: florentx

CHANGES.txt

@@ -20,6 +20,8 @@ Changelog
 * Do not crash when running AST checks and the document contains null bytes.
   (Issue #184)
 
+* Fix false positive E261/E262 when the file contains a BOM. (Issue #193)
+
 
 1.4.5 (2013-03-06)
 ------------------

pep8.py

@@ -1017,6 +1017,7 @@ def readlines(filename):
         finally:
             f.close()
 
+    BOM_UTF8 = '\xef\xbb\xbf'
     isidentifier = re.compile(r'[a-zA-Z_]\w*').match
     stdin_get_value = sys.stdin.read
 else:
@@ -1035,6 +1036,7 @@ def readlines(filename):
         finally:
             f.close()
 
+    BOM_UTF8 = '\ufeff'
     isidentifier = str.isidentifier
 
     def stdin_get_value():
@@ -1200,9 +1202,8 @@ def __init__(self, filename=None, lines=None,
                 self.lines = []
         else:
             self.lines = lines
-        bom = '\xEF\xBB\xBF'
-        if len(self.lines) and self.lines[0].startswith(bom):
-            self.lines[0] = self.lines[0][len(bom):]
+        if self.lines and self.lines[0].startswith(BOM_UTF8):
+            self.lines[0] = self.lines[0][len(BOM_UTF8):]
         self.report = report or options.report
         self.report_error = self.report.error