import os i = 0 with open( 'CKJ_lib.bak' ) as f: for line in f: tok = line.split() if len(tok) == 0: print( '' ) continue if tok[0] == 'P': tok[3:-2:2] = [str( int( t ) * 1.5 ) for t in tok[3:-2:2]] elif tok[0] == 'X' and int( tok[3] ) > 0: tok[3] = '1450' print( ' '.join( tok ) )