15.20小节完成

yidao620c · yidao620c · commit af083cce8be3 · 2015-12-25T17:45:40.000+08:00
diff --git a/source/c15/p20_consuming_an_iterable_from_c.rst b/source/c15/p20_consuming_an_iterable_from_c.rst
@@ -5,45 +5,45 @@
 ----------
 问题
 ----------
-You want to write C extension code that consumes items from any iterable object such
-as a list, tuple, file, or generator.
+你想写C扩展代码处理来自任何可迭代对象如列表、元组、文件或生成器中的元素。
 
 |
 
 ----------
 解决方案
 ----------
-Here is a sample C extension function that shows how to consume the items on an
-iterable:
-
-static PyObject *py_consume_iterable(PyObject *self, PyObject *args) {
-  PyObject *obj;
-  PyObject *iter;
-  PyObject *item;
-
-  if (!PyArg_ParseTuple(args, "O", &obj)) {
-    return NULL;
-  }
-  if ((iter = PyObject_GetIter(obj)) == NULL) {
-    return NULL;
-  }
-  while ((item = PyIter_Next(iter)) != NULL) {
-    /* Use item */
-    ...
-    Py_DECREF(item);
-  }
-
-  Py_DECREF(iter);
-  return Py_BuildValue("");
-}
+下面是一个C扩展函数例子，演示了怎样处理可迭代对象中的元素：
+
+::
+
+    static PyObject *py_consume_iterable(PyObject *self, PyObject *args) {
+      PyObject *obj;
+      PyObject *iter;
+      PyObject *item;
+
+      if (!PyArg_ParseTuple(args, "O", &obj)) {
+        return NULL;
+      }
+      if ((iter = PyObject_GetIter(obj)) == NULL) {
+        return NULL;
+      }
+      while ((item = PyIter_Next(iter)) != NULL) {
+        /* Use item */
+        ...
+        Py_DECREF(item);
+      }
+
+      Py_DECREF(iter);
+      return Py_BuildValue("");
+    }
 
 |
 
 ----------
 讨论
 ----------
-The code in this recipe mirrors similar code in Python. The PyObject_GetIter() call
-is the same as calling iter() to get an iterator. The PyIter_Next() function invokes
-the next method on the iterator returning the next item or NULL if there are no more
-items. Make sure you’re careful with memory management—Py_DECREF() needs to be
-called on both the produced items and the iterator object itself to avoid leaking memory.
+本节中的代码和Python中对应代码类似。
+``PyObject_GetIter()`` 的调用和调用 ``iter()`` 一样可获得一个迭代器。
+``PyIter_Next()`` 函数调用 ``next`` 方法返回下一个元素或NULL(如果没有元素了)。
+要注意正确的内存管理—— ``Py_DECREF()`` 需要同时在产生的元素和迭代器对象本身上同时被调用，
+以避免出现内存泄露。
