compatible with python3 (#792)

fix : http://newicafe.baidu.com:80/issue/DLTP-1929/show?from=page， fix book code is not compatible with python3

03.image_classification/README.cn.md

@@ -176,11 +176,12 @@ Paddle API提供了自动加载cifar数据集模块 `paddle.dataset.cifar`。
 让我们从导入 Paddle Fluid API 和辅助模块开始。
 
 ```python
+
+from __future__ import print_function
 import paddle
 import paddle.fluid as fluid
 import numpy
 import sys
-from __future__ import print_function
 
 ```
 

03.image_classification/README.md

@@ -170,11 +170,12 @@ After running the command `python train.py`, training will start immediately. Th
 Let's start with importing the Paddle Fluid API package and the helper modules.
 
 ```python
+
+from __future__ import print_function
 import paddle
 import paddle.fluid as fluid
 import numpy
 import sys
-from __future__ import print_function
 
 ```
 

03.image_classification/index.cn.html

@@ -218,11 +218,12 @@ Paddle API提供了自动加载cifar数据集模块 `paddle.dataset.cifar`。
 让我们从导入 Paddle Fluid API 和辅助模块开始。
 
 ```python
+
+from __future__ import print_function
 import paddle
 import paddle.fluid as fluid
 import numpy
 import sys
-from __future__ import print_function
 
 ```
 

03.image_classification/index.html

@@ -212,11 +212,12 @@ After running the command `python train.py`, training will start immediately. Th
 Let's start with importing the Paddle Fluid API package and the helper modules.
 
 ```python
+
+from __future__ import print_function
 import paddle
 import paddle.fluid as fluid
 import numpy
 import sys
-from __future__ import print_function
 
 ```
 

04.word2vec/README.cn.md

@@ -236,14 +236,14 @@ dream that one day <e>
 
 ```python
 
+from __future__ import print_function
+
 import paddle as paddle
 import paddle.fluid as fluid
 import six
 import numpy
 import math
 
-from __future__ import print_function
-
 ```
 
 然后，定义参数：

04.word2vec/README.md

@@ -201,14 +201,14 @@ First, load packages:
 
 ```python
 
+from __future__ import print_function
+
 import paddle as paddle
 import paddle.fluid as fluid
 import six
 import numpy
 import math
 
-from __future__ import print_function
-
 ```
 
 Then, define the parameters:

04.word2vec/index.cn.html

@@ -278,14 +278,14 @@ dream that one day <e>
 
 ```python
 
+from __future__ import print_function
+
 import paddle as paddle
 import paddle.fluid as fluid
 import six
 import numpy
 import math
 
-from __future__ import print_function
-
 ```
 
 然后，定义参数：

04.word2vec/index.html

@@ -243,14 +243,14 @@ First, load packages:
 
 ```python
 
+from __future__ import print_function
+
 import paddle as paddle
 import paddle.fluid as fluid
 import six
 import numpy
 import math
 
-from __future__ import print_function
-
 ```
 
 Then, define the parameters:

09.gan/README.cn.md

@@ -87,6 +87,10 @@ DCGAN中的生成器（G）结构如下图所示：
 首先加载 PaddlePaddle 的 Fluid 和其他相关包
 
 ```python
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
 import sys
 import os
 import matplotlib
@@ -101,9 +105,6 @@ import paddle.fluid as fluid
 matplotlib.use('agg')
 import matplotlib.pyplot as plt
 import matplotlib.gridspec as gridspec
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
 ```
 ### 定义辅助工具
 

09.gan/index.cn.html

@@ -129,6 +129,10 @@ DCGAN中的生成器（G）结构如下图所示：
 首先加载 PaddlePaddle 的 Fluid 和其他相关包
 
 ```python
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
 import sys
 import os
 import matplotlib
@@ -143,9 +147,6 @@ import paddle.fluid as fluid
 matplotlib.use('agg')
 import matplotlib.pyplot as plt
 import matplotlib.gridspec as gridspec
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
 ```
 ### 定义辅助工具