diff --git a/periodictable/activation.py b/periodictable/activation.py
index 87b8e67..78f504e 100644
--- a/periodictable/activation.py
+++ b/periodictable/activation.py
@@ -73,8 +73,6 @@
    http://cds.cern.ch/record/111089/files/IAEA-TR-273.pdf
 """
 
-from __future__ import division, print_function
-
 from math import exp, log, expm1
 import os
 
@@ -108,7 +106,7 @@ def IAEA1987_isotopic_abundance(iso):
     except AttributeError:
         return 0
 
-class Sample(object):
+class Sample:
     """
     Sample properties.
 
diff --git a/periodictable/core.py b/periodictable/core.py
index 915b9f9..0bb34c1 100644
--- a/periodictable/core.py
+++ b/periodictable/core.py
@@ -55,7 +55,6 @@
     periodic table with custom values for the attributes.
 
 """
-from __future__ import print_function
 
 __docformat__ = 'restructuredtext en'
 __all__ = ['delayed_load', 'define_elements', 'get_data_path',
diff --git a/periodictable/formulas.py b/periodictable/formulas.py
index 2c795f6..8e84b0d 100644
--- a/periodictable/formulas.py
+++ b/periodictable/formulas.py
@@ -3,7 +3,6 @@
 """
 Chemical formula parser.
 """
-from __future__ import division, print_function
 
 from copy import copy
 from math import pi, sqrt
diff --git a/periodictable/nsf.py b/periodictable/nsf.py
index 84b9e83..f8aeb81 100644
--- a/periodictable/nsf.py
+++ b/periodictable/nsf.py
@@ -155,7 +155,6 @@
     Academic Press. doi:10.1016/B978-0-12-398374-9.09989-7
 
 """
-from __future__ import print_function
 
 import numpy as np
 from numpy import sqrt, pi, asarray, inf
diff --git a/periodictable/util.py b/periodictable/util.py
index 2f9c25e..af3925d 100644
--- a/periodictable/util.py
+++ b/periodictable/util.py
@@ -124,11 +124,8 @@ def require_keywords(function):
     signature element which will force all keywords after '\*' to be named.
     """
     import functools
-    try:
-        from inspect import signature
-        getargspec = _getargspec_from_signature
-    except ImportError: # CRUFT: py 2.7 support
-        from inspect import getargspec
+    from inspect import signature
+    getargspec = _getargspec_from_signature
 
     args, vararg, varkwd, defaults = getargspec(function)
     if defaults is None: