diff --git a/build.py b/build.py
index 385e736..03ad1c7 100644
--- a/build.py
+++ b/build.py
@@ -22,8 +22,8 @@ from distutils import sysconfig
 # Start of user configurable options
 VERBOSE = True
 IDA_MAJOR_VERSION = 5
-IDA_MINOR_VERSION = 4
-if os.environ.has_key('IDA'):
+IDA_MINOR_VERSION = 5
+if 'IDA' in os.environ:
     IDA_SDK = os.environ['IDA']
 else:
     IDA_SDK = ".." + os.sep + "swigsdk-versions" + os.sep + "%d.%d" % (IDA_MAJOR_VERSION, IDA_MINOR_VERSION)
diff --git a/python/idc.py b/python/idc.py
index 117b256..ee8a446 100644
--- a/python/idc.py
+++ b/python/idc.py
@@ -1471,7 +1471,7 @@ def SetRegEx(ea, reg, value, tag):
 
            See also SetReg() compatibility macro.
     """
-    if _REGMAP.has_key(reg):
+    if reg in _REGMAP:
         return idaapi.splitSRarea1(ea, _REGMAP[reg], value, tag)
     else:
         return False
@@ -1889,7 +1889,7 @@ def GetReg(ea, reg):
            so to get paragraph pointed by the segment register you need to
            call AskSelector() function.
     """
-    if _REGMAP.has_key(reg):
+    if reg in _REGMAP:
         return idaapi.getSR(ea, _REGMAP[reg]) & 0xFFFF
     else:
         return False
@@ -3340,7 +3340,7 @@ def SetSegDefReg(ea, reg, value):
     """
     seg = idaapi.getseg(ea)
 
-    if seg and _REGMAP.has_key(reg):
+    if seg and reg in _REGMAP:
         return idaapi.SetDefaultRegisterValue(seg, _REGMAP[reg], value)
     else:
         return False