-period_kinds = ['all', 'dailies', 'monthlies', 'yearlies']
-period_scale = {'s': 1,
- 'min': 60,
- 'h': 60 * 60,
- 'd': 60 * 60 * 24,
- 'w': 60 * 60 * 24 * 7,
- 'm': 60 * 60 * 24 * 31,
- 'y': 60 * 60 * 24 * 366}
-period_scale_kinds = period_scale.keys()
+period_kinds = [b'all', b'dailies', b'monthlies', b'yearlies']
+period_scale = {b's': 1,
+ b'min': 60,
+ b'h': 60 * 60,
+ b'd': 60 * 60 * 24,
+ b'w': 60 * 60 * 24 * 7,
+ b'm': 60 * 60 * 24 * 31,
+ b'y': 60 * 60 * 24 * 366}
+period_scale_kinds = list(period_scale.keys())