python – Timedelta没有定义

下面是我正在处理的代码.从我可以告诉的没有问题,但是当我尝试运行这段代码时,我收到一个错误.

import os 
import datetime

def parSEOptions():

    import optparse
    parser = optparse.OptionParser(usage= '-h')
    parser.add_option('-t','--type',\
                      choices= ('Warning','Error','Information','All'),\
                      help= 'The type of error',default= 'Warning')
    parser.add_option('-g','--goback',\
                      type= 'string')
    (options,args) = parser.parse_args()
    return options

options = parSEOptions() now = datetime.datetime.now() subtract = timedelta(hours=options.goback) difference = now - subtract

if options.type=='All' and options.goback==24:
    os.startfile('logfile.htm')

else: 
    print
    print 'Type =',options.type,print
    print 'Go Back =',options.goback,'hours'
    print difference.strftime("%H:%M:%S %a,%B %d %Y")
    print

错误如下：

Traceback (most recent call last):
  File "C:\Python27\Lib\SITE-P~1\PYTHON~2\pywin\framework\scriptutils.py",line 325,in RunScript
    exec codeObject in __main__.__dict__
  File "C:\Users\user\Desktop\Python\python.py",line 19,in <module>
    subtract = timedelta(hours=options.goback)
NameError: name 'timedelta' is not defined

任何帮助将不胜感激.

解决方法

您已导入datetime,但未定义timedelta.你想要：

from datetime import timedelta

要么：

subtract = datetime.timedelta(hours=options.goback)

此外,您的goback参数被定义为一个字符串,但是您将其传递给timedelta作为小时数.您需要将其转换为整数,或者更好地仍然将您的选项中的type参数设置为int.