修改代码错误

0x4ec7 · 0x4ec7 · commit 84719609ea22 · 2016-01-09T14:37:19.000+08:00
next(iterator[, default])如果没有设置默认值，迭代结束的时候仍然会抛出StopIteration异常
diff --git a/source/c04/p01_manually_consuming_iterator.rst b/source/c04/p01_manually_consuming_iterator.rst
@@ -32,7 +32,7 @@
 
     with open('/etc/passwd') as f:
         while True:
-            line = next(f)
+            line = next(f, None)
             if line is None:
                 break
             print(line, end='')
