类型错误：无法比较日期时间

Question

我正在使用python脚本计算开始日期和结束日期之间的持续时间，比如20140520160000和20140520170000，这样我就可以得到小时。

我对这段代码有问题：

if epgDuration >= 0.10 and epgDuration <= 0.30:
   epgwidth = "250"

我试图比较0.10分钟和0.30分钟之间的时间范围时出错。

我得到的错误是：TypeError:无法将datetime.timedelta与float进行比较。

错误就在这条线上：

if epgDuration >= 0.10 and epgDuration <= 0.30:

结果如下：

14:44:55 T:1580  NOTICE: 0:30:00
14:44:55 T:1580  NOTICE: 2:30:00
14:44:55 T:1580  NOTICE: 3:00:00
14:44:55 T:1580  NOTICE: 1:00:00
14:44:55 T:1580  NOTICE: 0:30:00
14:44:55 T:1580  NOTICE: 0:30:00
14:44:55 T:1580  NOTICE: 0:30:00
14:44:55 T:1580  NOTICE: 0:30:00
14:44:55 T:1580  NOTICE: 0:30:00
14:44:55 T:1580  NOTICE: 0:30:00
14:44:55 T:1580  NOTICE: 1:00:00
14:44:55 T:1580  NOTICE: 0:30:00
14:44:55 T:1580  NOTICE: 0:30:00
14:44:55 T:1580  NOTICE: 0:30:00

下面是我用来持续时间的代码：

for row in programs:
    program_startdate = str(row[2])
    program_endDate = str(row[3])

    try:
       start_date = datetime.datetime.strptime(program_startdate, "%Y%m%d%H%M%S")
       end_date = datetime.datetime.strptime(program_endDate, "%Y%m%d%H%M%S")
    except TypeError:
       start_date = datetime.datetime.fromtimestamp(time.mktime(time.strptime(program_startdate, "%Y%m%d%H%M%S")))
       end_date = datetime.datetime.fromtimestamp(time.mktime(time.strptime(program_endDate, "%Y%m%d%H%M%S")))

    #workout the duration times to get the program time
    epgDuration = end_date - start_date

    if epgDuration >= 0.10 and epgDuration <= 0.30:
       epgwidth = "250"

    elif epgDuration >= 1.00 and epgDuration <= 1.29:
         epgwidth = "500"
    print epgwidth

Answer 1

要从timedetla对象获取分钟数，可以使用total_seconds()并除以60：

epgDurationMin = epgDuration.total_seconds()/60.
if 0.10 <= epgDurationMin <= 0.30:
   ...

还请注意，您可以使用python的coolcomparison-chaining（例如a <= b <= c）