将.xls文件的文件夹读取为.csv文件，添加空白行并将int转换为float

Question

当前，我的程序可以打开和读取文件夹中的所有.xlsx文件。然后，可以将它们一个一个地写入.csv文件。但是，它将在每行之后添加一个空白行，并将Int转换为我不想要的Float。差不多是新手。

root = tkinter.Tk()
root.withdraw()
path = tkinter.filedialog.askdirectory(parent=root,title='Select the directory with the assignments to grade')
folder = os.listdir(path)
with open('csvConsolidatedFile.csv', 'wb', delimiter=' ', lineterminator='\n') as outfile:
    wr = csv.writer(outfile)

for xlsFile in folder:
    document = os.path.join(path, xlsFile)
    wb = xlrd.open_workbook(document)
    for index in range(1,2):
        sh = wb.sheet_by_name('Sheet' + str(index))
        for rownum in range(sh.nrows):
            wr.writerow(sh.row_values(rownum))

csvConsolidatedFile.close()