core: fix bug in event's __str__ and __repr__

gevent/core.pyx

@@ -256,11 +256,11 @@ cdef class event:
         else:
             pending = ''
         if self.events_str:
-            event_str = ' %s' % self.events_str
+            events_str = ' %s' % self.events_str
         else:
-            event_str = ''
+            events_str = ''
         return '<%s at %s%s fd=%s%s flags=0x%x cb=%s arg=%s>' % \
-               (type(self).__name__, hex(id(self)), pending, self.fd, self.events_str, self.flags, self._callback, self._arg)
+               (type(self).__name__, hex(id(self)), pending, self.fd, events_str, self.flags, self._callback, self._arg)
 
     def __str__(self):
         if self.pending:
@@ -268,13 +268,13 @@ cdef class event:
         else:
             pending = ''
         if self.events_str:
-            event_str = ' %s' % self.events_str
+            events_str = ' %s' % self.events_str
         else:
-            event_str = ''
+            events_str = ''
         cb = str(self._callback).replace('\n', '\n' + ' ' * 8)
         arg = pformat(self._arg, indent=2).replace('\n', '\n' + ' ' * 8)
         return '%s%s fd=%s%s flags=0x%x\n  cb  = %s\n  arg = %s' % \
-               (type(self).__name__, pending, self.fd, self.events_str, self.flags, cb, arg)
+               (type(self).__name__, pending, self.fd, events_str, self.flags, cb, arg)
 
     def __enter__(self):
         return self