remove Py2vs3 maxsine hybridation

https://stackoverflow.com/questions/13795758/what-is-sys-maxint-in-python-3

nixio/block.py

@@ -7,10 +7,8 @@
 # modification, are permitted under the terms of the BSD License. See
 # LICENSE file in the root of the Project.
 
-try:
-    from sys import maxint
-except ImportError:
-    from sys import maxsize as maxint
+from sys import maxsize
+
 import numpy as np
 from inspect import isclass
 try:
@@ -396,7 +394,7 @@ def find_sources(self, filtr=lambda _: True, limit=None):
         :rtype: list of nixio.Source
         """
         if limit is None:
-            limit = maxint
+            limit = maxsize
         return finders._find_sources(self, filtr, limit)
 
     def pprint(self, indent=2, max_length=120, extra=True, start_depth=0):

nixio/file.py

@@ -9,12 +9,9 @@
 import os
 import gc
 import numpy as np
+from sys import maxsize
 from warnings import warn
 
-try:
-    from sys import maxint
-except ImportError:
-    from sys import maxsize as maxint
 import h5py
 
 from .hdf5.h5group import H5Group
@@ -478,7 +475,7 @@ def find_sections(self, filtr=lambda _: True, limit=None):
         :rtype: list of nixio.Section
         """
         if limit is None:
-            limit = maxint
+            limit = maxsize
         return finders._find_sections(self, filtr, limit)
 
     @property

nixio/section.py

@@ -6,15 +6,14 @@
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted under the terms of the BSD License. See
 # LICENSE file in the root of the Project.
-try:
-    from sys import maxint
-except ImportError:
-    from sys import maxsize as maxint
+from sys import maxsize
 try:
     from collections.abc import Sequence, Iterable
 except ImportError:
     from collections import Sequence, Iterable
+
 import numpy as np
+
 from .container import Container, SectionContainer
 from .datatype import DataType
 from .entity import Entity
@@ -386,7 +385,7 @@ def find_sections(self, filtr=lambda _: True, limit=None):
         :rtype: list of nixio.Section
         """
         if limit is None:
-            limit = maxint
+            limit = maxsize
         return finders._find_sections(self, filtr, limit)
 
     def find_related(self, filtr=lambda _: True):

nixio/source.py

@@ -6,7 +6,7 @@
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted under the terms of the BSD License. See
 # LICENSE file in the root of the Project.
-from sys import maxsize as maxint
+from sys import maxsize
 
 from .import exceptions
 from .entity import Entity
@@ -173,7 +173,7 @@ def find_sources(self, filtr=lambda _: True, limit=None):
         :rtype: list of nixio.Source
         """
         if limit is None:
-            limit = maxint
+            limit = maxsize
         return finders._find_sources(self, filtr, limit)
 
     @property