Changes to be committed:
	new file:   12-2.rst
	new file:   12-2_random_walk_d2.aux
	new file:   12-2_random_walk_d2.dvi
	new file:   12-2_random_walk_d2.pdf
	new file:   12-2_random_walk_d2.py
	new file:   12-2_random_walk_d2.tex
	new file:   12-2_random_walk_d2.tex.backup
	new file:   MyDialog.py
	new file:   before.txt
	new file:   figure_1.pdf
	new file:   figure_1.png
	new file:   figure_1.xbb
	new file:   figure_2.pdf
	new file:   figure_2.png
	new file:   figure_2.xbb
	new file:   figure_3.pdf
	new file:   figure_3.png
	new file:   figure_3.xbb
	new file:   figure_4.pdf
	new file:   figure_4.png
	new file:   figure_4.xbb
	new file:   random_walk_d2.c
	new file:   random_walk_d2.pyx
	new file:   run.py
	new file:   setup.py