module: use yapf formatter, reduce pylint warnings

demo.py

@@ -1,12 +1,16 @@
 #!/usr/bin/env python
-# -*- coding: UTF-8 -*-
 
 import bme280
 
-if __name__ == '__main__':
+
+def main():
     bme = bme280.Bme280()
     bme.set_mode(bme280.MODE_FORCED)
     t, p, h = bme.get_data()
-    print "Temperature: %f °C" % t
-    print "Pressure: %f P" % p
-    print "Humidity: %f %%" % h
+    print("Temperature: %f °C" % t)
+    print("Pressure: %f P" % p)
+    print("Humidity: %f %%" % h)
+
+
+if __name__ == '__main__':
+    main()