fix style in init.py. add travis

.travis.yml

+language: "python"
+python:
+   - "2.7"
+sudo: false
+cache: pip
+
+before_script:
+  - pip install flake8
+  - flake8 --version
+script:
+  - flake8 .
+  - cd examples && flake8 .
+
+notifications:
+  email: false

tensorpack/RL/__init__.py

@@ -3,7 +3,6 @@
 #  Author: Yuxin Wu <ppwwyyxx@gmail.com>
 
 from pkgutil import walk_packages
-import importlib
 import os
 import os.path
 
@@ -18,6 +17,7 @@ def _global_import(name):
         globals()[k] = p.__dict__[k]
         __all__.append(k)
 
+
 for _, module_name, _ in walk_packages(
         [os.path.dirname(__file__)]):
     if not module_name.startswith('_'):

tensorpack/callbacks/__init__.py

@@ -17,6 +17,7 @@ def _global_import(name):
         globals()[k] = p.__dict__[k]
         __all__.append(k)
 
+
 _CURR_DIR = os.path.dirname(__file__)
 for _, module_name, _ in walk_packages(
         [_CURR_DIR]):

tensorpack/dataflow/__init__.py

@@ -3,7 +3,6 @@
 #  Author: Yuxin Wu <ppwwyyxx@gmail.com>
 
 from pkgutil import walk_packages
-import importlib
 import os
 import os.path
 
@@ -21,6 +20,7 @@ def _global_import(name):
         globals()[k] = p.__dict__[k]
         __all__.append(k)
 
+
 __SKIP = ['dftools', 'dataset', 'imgaug']
 for _, module_name, _ in walk_packages(
         [os.path.dirname(__file__)]):

tensorpack/dataflow/dataset/__init__.py

@@ -17,6 +17,7 @@ def global_import(name):
         globals()[k] = p.__dict__[k]
         __all__.append(k)
 
+
 for _, module_name, _ in walk_packages(
         [os.path.dirname(__file__)]):
     if not module_name.startswith('_'):

tensorpack/dataflow/imgaug/__init__.py

@@ -16,6 +16,7 @@ def global_import(name):
         globals()[k] = p.__dict__[k]
         __all__.append(k)
 
+
 for _, module_name, _ in walk_packages(
         [os.path.dirname(__file__)]):
     if not module_name.startswith('_'):

tensorpack/models/__init__.py

@@ -4,7 +4,6 @@
 
 from pkgutil import walk_packages
 from types import ModuleType
-import tensorflow as tf
 import six
 import os
 import os.path
@@ -21,6 +20,7 @@ def _global_import(name):
         globals()[k] = p.__dict__[k]
         __all__.append(k)
 
+
 for _, module_name, _ in walk_packages(
         [os.path.dirname(__file__)]):
     if not module_name.startswith('_'):

tensorpack/predict/__init__.py

@@ -17,6 +17,7 @@ def global_import(name):
         globals()[k] = p.__dict__[k]
         __all__.append(k)
 
+
 _CURR_DIR = os.path.dirname(__file__)
 for _, module_name, _ in walk_packages(
         [_CURR_DIR]):

tensorpack/tfutils/__init__.py

@@ -7,6 +7,7 @@ import os
 
 __all__ = []
 
+
 def _global_import(name):
     p = __import__(name, globals(), None, level=1)
     lst = p.__all__ if '__all__' in dir(p) else dir(p)
@@ -14,6 +15,7 @@ def _global_import(name):
         globals()[k] = p.__dict__[k]
         __all__.append(k)
 
+
 _TO_IMPORT = set([
     'sessinit',
     'common',
@@ -34,4 +36,3 @@ for _, module_name, _ in walk_packages(
         _global_import(module_name)
     if module_name != 'common':
         __all__.append(module_name)
-

tensorpack/train/__init__.py

@@ -17,6 +17,7 @@ def global_import(name):
         globals()[k] = p.__dict__[k]
         __all__.append(k)
 
+
 _CURR_DIR = os.path.dirname(__file__)
 for _, module_name, _ in walk_packages(
         [_CURR_DIR]):

tensorpack/utils/__init__.py

@@ -20,6 +20,7 @@ def _global_import(name):
         globals()[k] = p.__dict__[k]
         __all__.append(k)
 
+
 _TO_IMPORT = set([
     'naming',
     'utils',

tox.ini

 [flake8]
 max-line-length = 120
 exclude = .git,
-					__init__.py,
+					tensorpack/__init__.py,
 					snippet,
-					docs
+					docs,
+					examples,
+					_test.py