How can I get the full file path of an icon name?

How can I get the full file path from an开发者_运维技巧 icon name in GNOME?

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import gtk
icon_theme = gtk.icon_theme_get_default()
icon_info = icon_theme.lookup_icon("my-icon-name", 48, 0)
print icon_info.get_filename()

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Translation for Python 3:

from gi.repository import Gtk
icon_theme = Gtk.IconTheme.get_default()
icon_info = icon_theme.lookup_icon("my-icon-name", 48, 0)
print(icon_info.get_filename())