Valueerror: Namespace Gtk Not Available

ValueError: Namespace Gtk not available

You need to install gobject-introspection, python3-gi and gir1.2-gtk-3.0, these packages includes the files to expose the GTK+ libs to python3.

sudo apt install python3-gi gobject-introspection gir1.2-gtk-3.0

For CENTOS (7)/OpenSUSE (15.1), you have to substitute the package gir1.2-gtk-3.0 with gtk3-devel in dnf/yum/zypper respectively - thanks bgStack.

root@oz123:/home/oz123# python3
Python 3.6.8 (default, Jan 14 2019, 11:02:34) 
[GCC 8.0.1 20180414 (experimental) [trunk revision 259383]] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import gi
>>> gi.require_version('Gtk', '3.0')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3/dist-packages/gi/__init__.py", line 130, in require_version
    raise ValueError('Namespace %s not available' % namespace)
ValueError: Namespace Gtk not available
>>> 
root@oz123:/home/oz123# apt install -y gir1.2-gtk-3.0
root@oz123:/home/oz123# python3
Python 3.6.8 (default, Jan 14 2019, 11:02:34) 
[GCC 8.0.1 20180414 (experimental) [trunk revision 259383]] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import gi
>>> gi.require_version('Gtk', '3.0')
>>> 

side-note

Packages calles xyz-dev in debian\ubuntu contain C headers, pkg-config files and autotools macros. These are only needed if you intend to build software using compiled languages such as C and C++.
These all are installed to:

/usr/include/../xyz/header1.h  # headers
/usr/include/../xyz/header2.h
...
/usr/lib/x86_64-linux-gnu/pkgconfig/libxyz.pc  # pkgconfig files
...
/usr/share/aclocal/xyz.m4  # autotools macros

Use dpkg -L libgtk-3-dev to see all the files installed by this package on your system.

update

please remove dropbox with dpkg -r dropbox Than reinstall with the following command

root@yeni2:/# dpkg -i dropbox_2019.02.14_amd64.deb 
Selecting previously unselected package dropbox.
(Reading database ... 126384 files and directories currently installed.)
Preparing to unpack dropbox_2019.02.14_amd64.deb ...
Unpacking dropbox (2019.02.14) ...
dpkg: dependency problems prevent configuration of dropbox:
 dropbox depends on libpango1.0-0 (>= 1.36.3); however:
  Package libpango1.0-0 is not installed.

dpkg: error processing package dropbox (--install):
 dependency problems - leaving unconfigured
Processing triggers for man-db (2.8.3-2) ...
Processing triggers for gnome-menus (3.13.3-11ubuntu1) ...
Processing triggers for desktop-file-utils (0.23-1ubuntu3) ...
Processing triggers for mime-support (3.60ubuntu1) ...
Processing triggers for hicolor-icon-theme (0.17-2) ...
Errors were encountered while processing:
 dropbox

Now if there missing dependencies fix them with:

root@yeni2:/# apt install -f
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Correcting dependencies... Done
The following additional packages will be installed:
  libpango1.0-0 libpangox-1.0-0
The following NEW packages will be installed:
  libpango1.0-0 libpangox-1.0-0
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
Need to get 45.0 kB of archives.
After this operation, 203 kB of additional disk space will be used.
Do you want to continue? [Y/n] 
Get:1 http://de.archive.ubuntu.com/ubuntu bionic/universe amd64 libpangox-1.0-0 amd64 0.0.2-5 [41.7 kB]
Get:2 http://de.archive.ubuntu.com/ubuntu bionic/universe amd64 libpango1.0-0 amd64 1.40.14-1 [3,332 B]
Fetched 45.0 kB in 0s (264 kB/s)    
debconf: delaying package configuration, since apt-utils is not installed
Selecting previously unselected package libpangox-1.0-0:amd64.
(Reading database ... 126411 files and directories currently installed.)
Preparing to unpack .../libpangox-1.0-0_0.0.2-5_amd64.deb ...
Unpacking libpangox-1.0-0:amd64 (0.0.2-5) ...
Selecting previously unselected package libpango1.0-0:amd64.
Preparing to unpack .../libpango1.0-0_1.40.14-1_amd64.deb ...
Unpacking libpango1.0-0:amd64 (1.40.14-1) ...
Setting up libpangox-1.0-0:amd64 (0.0.2-5) ...
Setting up libpango1.0-0:amd64 (1.40.14-1) ...
Setting up dropbox (2019.02.14) ...
Please restart all running instances of Nautilus, or you will experience problems. i.e. nautilus --quit
Dropbox installation successfully completed! You can start Dropbox from your applications menu.
Processing triggers for libc-bin (2.27-3ubuntu1) ...

Ubuntu - Anaconda 2020.02 - Namespace Gtk not available

There is a gtk3 package available on conda-forge:

conda install -c conda-forge gtk3

gtk3 Windows - Exe made by cx_freeze gives ValueError : Namespace Gtk not available

Well , I tried this on Pyinstaller as well got the same error , but found the solution
here

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