use a SortedList

firanka/series/base.py

@@ -5,6 +5,7 @@ import six
 
 from firanka.exceptions import NotInDomainError
 from firanka.ranges import Range, EMPTY_SET
+from sortedcontainers import SortedList
 
 
 class Series(object):
@@ -117,6 +118,9 @@ class Series(object):
 
 class DiscreteSeries(Series):
     def __init__(self, data, domain=None, *args, **kwargs):
+
+        data = SortedList(data)
+
         if len(data) == 0:
             domain = EMPTY_SET
         elif domain is None:

requirements.txt

 six
+sortedcontainers

setup.cfg

@@ -20,7 +20,7 @@ author_email = piotrm@dms-serwis.pl
 url = https://github.com/smok-serwis/firanka
 
 [pycodestyle]
-max-line-length=80
+max-line-length=100
 
 [bdist_wheel]
 universal=1