diff --git a/lazyscripts/constant.py b/lazyscripts/constant.py
new file mode 100644
index 0000000..7f57f02
--- /dev/null
+++ b/lazyscripts/constant.py
@@ -0,0 +1,45 @@
+
+##Python 
+PYTHON_VERSION = '2.6.0'
+
+### DISTRIBUTION
+# Debian base
+DIST_DEBIAN = 'debian'
+DIST_UBUNTU = 'ubuntu'
+DIST_LINUXMINT = 'linuxmint'
+
+DIST_DEB_BASE = \
+        (DIST_DEBIAN,
+         DIST_UBUNTU,
+         DIST_LINUXMINT)
+
+
+# RPM Base
+DIST_REDHAT = 'redhat'
+DIST_CENTOS = 'centos'
+DIST_FEDORA = 'fedora'
+
+DIST_SUSE = 'suse'
+DIST_OPENSUSE = 'opensuse'
+DIST_MANDRIVA = 'mandriva'
+
+DIST_RPM_BASE = \
+        (DIST_REDHAT,
+         DIST_CENTOS,
+         DIST_FEDORA,
+         DIST_SUSE,
+         DIST_OPENSUSE,
+         DIST_MANDRIVA)
+
+# BSD Base
+DIST_MACOSX = 'macosx'
+
+### Architecture
+ARCH_I386 = 'i386'
+ARCH_AMD64 = 'amd64'
+
+### System
+SYSTEM_LINUX = 'Linux'
+SYSTEM_MAC = 'Darwin'
+# not ready
+#SYSTEM_BSD = ''
diff --git a/lazyscripts/distro.py b/lazyscripts/distro.py
index 9aaef4c..4dd63db 100755
--- a/lazyscripts/distro.py
+++ b/lazyscripts/distro.py
@@ -21,6 +21,7 @@
 import platform
 
 from lazyscripts import pkgmgr
+from lazyscripts.constant import *
 
 class DistrobutionNotFound(Exception):
     "The distrobution can not be detected."
@@ -45,7 +46,7 @@ def __repr__(self):
     def __init__(self):
         # linux_distribution is insted of dist
         # Ref: http://docs.python.org/library/platform.html
-        if platform.python_version() < '2.6.0':
+        if platform.python_version() < PYTHON_VERSION:
             (self.name, self.version, self.codename) = platform.dist()
         else:
             (self.name, self.version, self.codename) = platform.linux_distribution()
@@ -63,9 +64,9 @@ def pkgsrc_name(self):
 
         @return str
         """
-        if self.name in ('ubuntu', 'debian', 'linuxmint'):
+        if self.name in DIST_DEB_BASE:
             extend = 'list'
-        elif self.name in ('fedora', 'redhat', 'centos','opensuse','suse','mandriva'):
+        elif self.name in DIST_RPM_BASE:
             extend = 'sh'
         return "lzs_%s_%s_%s.%s" % (platform.machine(),
                                           self.name,
@@ -93,32 +94,32 @@ def _reduce_name(self):
                 raise DistrobutionNotFound()
         elif self.name == 'susE':
             if commands.getoutput('cat /etc/SuSE-release | grep "openSUSE"'):
-                self.name = 'opensuse'
-        elif self.name == 'redhat':
+                self.name = DIST_OPENSUSE
+        elif self.name == DIST_REDHAT:
             if commands.getoutput('cat /etc/redhat-release | grep "Red Hat"'):
-                self.name = 'redhat'
+                self.name = DIST_REDHAT
             if commands.getoutput('cat /etc/redhat-release | grep "CentOS"'):
-                self.name = 'centos'
+                self.name = DIST_CENTOS
         elif self.name in ('mandrake', 'mandriva linux'):
             if os.path.exists('/etc/mandriva-release') and \
                commands.getoutput('cat /etc/mandriva-release | grep "Mandriva"'):
-             self.name = 'mandriva'
+             self.name = DIST_MANDRIVA
     #}}}
 
     #{{{def _reduce_version(self):
     def _reduce_version(self):
         if self.name == 'opensolaris' and not self.version:
             self.version = commands.getoutput('cat /etc/release | grep "OpenSolaris" | cut -d " " -f 27')
-        elif self.name == 'debian':
+        elif self.name == DIST_DEBIAN:
             self.version = self.version.split('.')[0]
     #}}}
 
     def _reduce_architecture(self):
         arch = platform.architecture()[0]
         if arch == '32bit':
-            self.architecture = 'i386'
+            self.architecture = ARCH_I386
         elif arch == '64bit':
-            self.architecture = 'amd64'
+            self.architecture = ARCH_AMD64
         else:
             self.architecture = None