Fix install_docker.rst and data_sources file open mode

* Follow #223
* Fix #222

doc/build/docker_install.rst

@@ -69,7 +69,7 @@ If you want to launch container with GPU support, you need to set some environme
 
 ..  code-block:: bash
 
-    export CUDA_SO="$(\ls /usr/lib64/libcuda* | xargs -I{} echo '-v {}:{}') $(\ls /usr/lib64/libnvidia* | xargs -I{} echo '-v {}:{}"
+    export CUDA_SO="$(\ls /usr/lib64/libcuda* | xargs -I{} echo '-v {}:{}') $(\ls /usr/lib64/libnvidia* | xargs -I{} echo '-v {}:{}')"
     export DEVICES=$(\ls /dev/nvidia* | xargs -I{} echo '--device {}:{}')
     docker run ${CUDA_SO} ${DEVICES} -it paddledev/paddle:gpu-latest
 

python/paddle/trainer_config_helpers/data_sources.py

@@ -68,7 +68,7 @@ def define_py_data_source(file_list, cls, module,
         file_list_name = 'train.list'
         if isinstance(cls, TestData):
             file_list_name = 'test.list'
-        with open(file_list_name, 'r') as f:
+        with open(file_list_name, 'w') as f:
             f.writelines(file_list)
         file_list = file_list_name