rename the file for specified folder and file type

''' This script used to rename the file that you specified.
    Usage: rename.py parameter1 parameter2.
    parameter1 is the parent path(dir) of the file that you want to rename.
    parameter2 is the file type which you want to rename.
'''
import os
import re
import sys

def rename_p(path,file_type):
    path=path
    filenames=os.listdir(path)
    regx="^SPC.*"+"."+file_type+"$"
    #print regx
    
    for f in filenames:
        #print f
        if re.search(regx,f)!=None:
            '''Split the filename and extension'''
            oldname=os.path.splitext(f)[0]
            #print 'The old name is:', oldname
            ext=os.path.splitext(f)[1]
            #print 'The extentsion is:',ext
            #new_name='SPC_'+oldname+'.'+file_type
            new_name=oldname+'.'+'JPEG'
            os.rename(path+'\\'+f,path+'\\'+new_name)
    for f in os.listdir(path):
        print f
     
        
if __name__=='__main__':
    path=sys.argv[1]
    file_type=sys.argv[2]
    rename_p(path,file_type)