why not
install -Dpm 0644 foo.py $RPM_BUILD_ROOT%{python_sitelib}/foo/foo.py
just in one line.
like:
>
> %install
> install -d $RPM_BUILD_ROOT%{python_sitelib}/foo
> install -pm 0644 foo.py $RPM_BUILD_ROOT%{python_sitelib}/foo/
>
------------
Itamar Reis Peixoto
e-mail/msn/google talk/sip: itamar(a)ispbrasil.com.br
skype: itamarjp
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+55 34 3221 8599