python xlsxwriter创建excel 之('Exception caught in workbook destructor. Explicit close() may be required for workbook.',)

python2.7使用xlsxwriter创建excel ，不关闭xlsxwriter对象，会报错：

Exception Exception: Exception('Exception caught in workbook destructor. Explicit close() may be required for workbook.',) in <bound method Workbook.__del__ of <xlsxwriter.workbook.Workbook object at 0x0000000002215400>> ignored

脚本如下：

#coding=utf-8
import xlsxwriter

#创建excel文件
workbook = xlsxwriter.Workbook('test.xlsx')
worksheet = workbook.add_worksheet('test')

报错信息如下：

查资料才知道 一定要把xlsxwriter对象给关闭了，加上workbook.close()后,完美解决 文件创建成功，如下截图：

注：python3.6版本没此问题，不用workbook.close()，也可以执行成功！