Ctags –exclude Exclusion does not seem to work?

  question, vim 
ctags -R -I __THROW -I __attribute_pure__ -I __nonnull -I __attribute__ --file-scope=yes --langmap=c:+.h --languages=c,c++ --links=yes --c-kinds=+p --c++-kinds=+p --fields=+iaS --extra=+q  \
 -f .vim/tags/c.tag /usr/include/*  --exclude="/usr/include/python2.7/" --exclude="/usr/include/python3.4"  --exclude="/usr/include/php5"  --exclude="/usr/include/ruby-2.1.0"

I found that ctags still wrote the contents of /usr/include/python2.7/ into c.tags

Please see:
grep “python*” /home/debian8/.vim/tags/c.tag

yoff /usr/include/python2.7/Imaging.h /^ int xsize, ysize, xoff, yoff; $/; ” m struct:ImagingCodecStateInstance access:public
ysize /usr/include/python2.7/ImDib.h /^ int xsize, ysize; $/; ” m struct:ImagingDIBInstance access:public
ysize /usr/include/python2.7/Imaging.h /^ int xsize, ysize, xoff, yoff; $/; ” m struct:ImagingCodecStateInstance access:public
ysize /usr/include/python2.7/Imaging.h /^ int ysize; $/; ” m struct:ImagingMemoryInstance access:public
ystep /usr/include/python2.7/Imaging.h /^ int ystep; $/; ” m struct:ImagingCodecStateInstance access:public

Double quotes should not be required

Another method is to put the path to be excluded into the file.

$ ctags -R --exclude=@.ctagsignore .

Ctagsignore’s content is

/usr/include/python2.7/
 /usr/include/python3.4
 /usr/include/php5
 /usr/include/ruby-2.1.0

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