fatal error: 'lzma.h' file not found and other installation errors

Hi to everybody
o
 my name's  Adriano and I?m trying to install wxPython to further use for 
the package python-mapper.
I'm coming across a real hard time in installing it and, honestly speaking, 
I don't understand what's happening under the hook!

I tried several ways:
1) I made "brew install wxwidgets" and it worked
2) I downloaded wxPython as a .tar , opened it and made use of setup.py 
file but this error turned off my instalation 

'lzma.h' file not found

3) later I tried to download it by pip with : sudo pip install --upgrade 
--pre -f https://wxpython.org/Phoenix/snapshot-builds/ wxPython

But when I open the python console to check the presence of wx it raises 
this error: ImportError: No module named _core

4) making pip install wxPython it spell out:
Requirement already satisfied: wxPython in 
/Users/adriano/virtualenvs/TDA/lib/python2.7/site-packages

I'm really running out of ideas in this moment, what am I doing wrong?

Best 

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