A error about pyuic4

Question

I'm trying to transform my ui file to .py file, but when I run pyuic4 in the shell, I get an error:

# pyuic4 main.ui > main_ui.py
File "/usr/lib/python2.7/site-packages/PyQt4/uic/pyuic.py", line 2
exec /usr/bin/python /usr/lib/python2.7/site-packages/PyQt4/uic/pyuic.py ${1+"$@"}
     ^
SyntaxError: invalid syntax

my os is fedora16