I am getting an error while writing my first app as shown in developer get-started tutorial

Question

I am trying to learn to develop apps in ubuntu and currently i am going through this tutorial.

As shown in the video I am writing the below given codes:

self.refreshbutton = self.builder.get_object("refreshbutton")
def on_refreshbutton_clicked(self, widget):
print "Refresh"

As soon as I try to run my application it is giving me an error :

I type this command to run my application : quickly run

(trickybrowser:4418): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:1971:11: Not using units is deprecated. Assuming 'px'.

(trickybrowser:4418): Gtk-WARNING **: Failed to parse /usr/share/themes/mac-os-lion-theme-v2/gtk-3.0/settings.ini: Key file contains line '/* ' which is not a key-value pair, group, or comment
Traceback (most recent call last):
  File "bin/trickybrowser", line 32, in <module>
    import trickybrowser
  File "/home/tricky/trickybrowser/trickybrowser/__init__.py", line 14, in <module>
    from trickybrowser import TrickybrowserWindow
  File "/home/tricky/trickybrowser/trickybrowser/TrickybrowserWindow.py", line 32
    print "Refresh"
        ^
IndentationError: expected an indented block

Answer 1

Remember about indent:

self.refreshbutton = self.builder.get_object("refreshbutton")
def on_refreshbutton_clicked(self, widget):
    print "Refresh"

Answer 2

(trickybrowser:4418): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:1971:11: Not using units is deprecated. Assuming 'px'.

(trickybrowser:4418): Gtk-WARNING **: Failed to parse /usr/share/themes/mac-os-lion-theme-v2/gtk-3.0/settings.ini: Key file contains line '/* ' which is not a key-value pair, group, or comment

These 2 Gtk-WARNINGS are due to some errors in the settings.ini file and gtk-widgets.css of the mac-os-lion theme.

To Correct them,

• sudo gedit /usr/share/themes/mac-os-lion-theme-v2/gtk-3.0/settings.ini.
  
  Use # for comments instead of \* .. */

#
#   AUTHOR: mbossg
#   WEBSITE: http://mbossg.deviantart.com
#   LICENSE: GPL
#   DESCRIPTION: A minimalistic and usable theme made for gtk3 apps.
#

• sudo gedit /usr/share/themes/mac-os-lion-theme-v2/gtk-3.0/gtk-widgets.css.
  
  Goto line number 1971 and replace padding: 8; with padding: 8px;

• That's it. No more warnings from Gtk. Have a Happy Time using mac-os-lion-theme !!!