ImportError: No module named Tkinter

[Joaquín Silva]

Hello,
I'm trying to import import matplotlib.pyplot but it throws this error:

ile "<stdin>", line 1, in <module>
  File "/usr/lib64/python2.7/site-packages/matplotlib/pyplot.py", line 115, in 
<module>
    _backend_mod, new_figure_manager, draw_if_interactive, _show = pylab_setup()
  File "/usr/lib64/python2.7/site-packages/matplotlib/backends/__init__.py", 
line 32, in pylab_setup
    globals(),locals(),[backend_name],0)
  File 
"/usr/lib64/python2.7/site-packages/matplotlib/backends/backend_tkagg.py", line 
6, in <module>
    from six.moves import tkinter as Tk
  File "/usr/lib/python2.7/site-packages/six.py", line 203, in load_module
    mod = mod._resolve()
  File "/usr/lib/python2.7/site-packages/six.py", line 115, in _resolve
    return _import_module(self.mod)
  File "/usr/lib/python2.7/site-packages/six.py", line 82, in _import_module
    __import__(name)
ImportError: No module named Tkinter

Tkinter is installed and I can import matplotlib.pyplot in the machine python 
console.
I'm using Zeppelin 0.6 in CentOS 7 with python 2.7.5

Regards,
Joaquín Silva