use yapf to format python code, add style config file

QiJune · QiJune · commit a45e6c95bd66 · 2016-11-10T07:20:54.000Z
diff --git a/.style.yapf b/.style.yapf
@@ -0,0 +1,5 @@
+[style]
+based_on_style = google
+indent_width = 4
+spaces_before_comment = 4
+split_before_logical_operator = true
