Handle broken pipe in check_files()

This way partial output (e.g. "pep8 . | head") doesn't get clobbered with a
stacktrace on stderr.

1 files changed, 4 insertions, 0 deletions

diff --git a/pep8.py b/pep8.py
index 2c683ab..1e52c3e 100755
--- a/pep8.py
+++ b/pep8.py
@@ -55,6 +55,7 @@ import time
 import inspect
 import keyword
 import tokenize
+import errno
 from optparse import OptionParser
 from fnmatch import fnmatch
 try:
@@ -1672,6 +1673,9 @@ class StyleGuide(object):
                     runner(path)
         except KeyboardInterrupt:
             print('... stopped')
+        except IOError as e:
+            if e.errno != errno.EPIPE:
+                raise e
         report.stop()
         return report