Fix python 2.6 compatibility

Add argparse as requirement when running on python 2.6.

glances/plugins/glances_help.py

@@ -59,9 +59,9 @@ class Plugin(GlancesPlugin):
 
         # Build the string message
         # Header
-        msg = "{} {}".format(__appname__.title(), __version__)
+        msg = "{0} {1}".format(__appname__.title(), __version__)
         ret.append(self.curse_add_line(msg, "TITLE"))
-        msg = " {} {}".format(_("with PsUtil"), __psutil_version__)
+        msg = " {0} {1}".format(_("with psutil"), __psutil_version__)
         ret.append(self.curse_add_line(msg))
         ret.append(self.curse_new_line())
 

glances/plugins/glances_uptime.py

@@ -65,7 +65,7 @@ class Plugin(GlancesPlugin):
         ret = []
 
         # Add the line with decoration
-        ret.append(self.curse_add_line(_("Uptime: {}").format(self.stats)))
+        ret.append(self.curse_add_line(_("Uptime: {0}").format(self.stats)))
 
         # Return the message with decoration
         return ret

setup.py

@@ -8,8 +8,7 @@ from setuptools import setup
 
 data_files = [
     ('share/doc/glances', ['AUTHORS', 'COPYING', 'NEWS', 'README.rst',
-                           'conf/glances.conf', 'docs/glances-doc.rst', 
-                           'docs/glances-doc.html']),
+                           'conf/glances.conf', 'docs/glances-doc.html']),
     ('share/doc/glances/images', glob.glob('docs/images/*.png')),
     ('share/man/man1', ['man/glances.1'])
 ]
@@ -32,6 +31,9 @@ if sys.platform.startswith('win'):
 else:
     requires = ['psutil>=2.0.0']
 
+if sys.version_info < (2, 7):
+    requires += ['argparse']
+
 setup(
     name='Glances',
     version='2.0',