concatenate all xls files in directory tree

gistfile1.txt

import os
import shutil
import xlrd
import xlwt

rootdir = os.getcwd()

wkbk = xlwt.Workbook()
outsheet = wkbk.add_sheet('Sheet1')

outrow_idx = 0

for dirpath, subdirnames, filenames in os.walk(rootdir):
    for filename in filenames:
        print "path: " + dirpath + " \\ " + filename

        if filename.endswith("_Report.xls"):
            current_file = os.path.join(dirpath, filename)
            thisbook = xlrd.open_workbook(current_file)

            insheet = xlrd.open_workbook(current_file).sheets()[0]
            # not reading first line of each file
            for row_idx in range(1, insheet.nrows):
                for col_idx in xrange(insheet.ncols):
                    outsheet.write(outrow_idx, col_idx,
                                   insheet.cell_value(row_idx, col_idx))
                outrow_idx += 1
wkbk.save(r'C:\combined.xls')