diff --git a/doc/build/docker_install.rst b/doc/build/docker_install.rst
index 542b9bac27afb84d2b41e5295145540bf2aa5485..e95de35f4da35fee511551f13bc6026532cce5c3 100644
--- a/doc/build/docker_install.rst
+++ b/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
 
diff --git a/python/paddle/trainer_config_helpers/data_sources.py b/python/paddle/trainer_config_helpers/data_sources.py
index 3b5c17a271f02b4a7506c4b2ffc10d3759dd97c7..f51140656d0dcfed14c67fd6f1d60351ba5e8ab2 100644
--- a/python/paddle/trainer_config_helpers/data_sources.py
+++ b/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