如何在 python 中的 datetime.timedelta 上执行除法？
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How can I perform divison on a datetime.timedelta in python?
提问by Luke
I'd like to be able to do the following:
我希望能够执行以下操作：
num_intervals = (cur_date - previous_date) / interval_length
or
或者
print (datetime.now() - (datetime.now() - timedelta(days=5)))
/ timedelta(hours=12)
# won't run, would like it to print '10'
but the division operation is unsupported on timedeltas. Is there a way that I can implement divison for timedeltas?
但 timedeltas 不支持除法运算。有没有办法可以为 timedeltas 实现除法？
Edit:Looks like this was added to Python 3.2 (thanks rincewind!): http://bugs.python.org/issue2706
编辑：看起来这已添加到 Python 3.2（感谢 rincewind！）：http://bugs.python.org/issue2706
采纳答案by David Z
Sure, just convert to a number of seconds (minutes, milliseconds, hours, take your pick of units) and do the division.
当然，只需转换为秒数（分钟、毫秒、小时，选择单位）并进行除法。
EDIT(again): so you can't assign to timedelta.__div__. Try this, then:
编辑（再次）：所以你不能分配给timedelta.__div__. 试试这个，然后：
divtdi = datetime.timedelta.__div__
def divtd(td1, td2):
if isinstance(td2, (int, long)):
return divtdi(td1, td2)
us1 = td1.microseconds + 1000000 * (td1.seconds + 86400 * td1.days)
us2 = td2.microseconds + 1000000 * (td2.seconds + 86400 * td2.days)
return us1 / us2 # this does integer division, use float(us1) / us2 for fp division
And to incorporate this into nadia's suggestion:
并将其纳入 nadia 的建议中：
class MyTimeDelta:
__div__ = divtd
Example usage:
用法示例：
>>> divtd(datetime.timedelta(hours = 12), datetime.timedelta(hours = 2))
6
>>> divtd(datetime.timedelta(hours = 12), 2)
datetime.timedelta(0, 21600)
>>> MyTimeDelta(hours = 12) / MyTimeDelta(hours = 2)
6
etc. Of course you could even name (or alias) your custom class timedeltaso it gets used in place of the real timedelta, at least in your code.
等等。当然你甚至可以命名（或别名）你的自定义类，timedelta这样它就可以代替真正的timedelta，至少在你的代码中。
回答by sth
Division and multiplication by integers seems to work out of the box:
整数的除法和乘法似乎是开箱即用的：
>>> from datetime import timedelta
>>> timedelta(hours=6)
datetime.timedelta(0, 21600)
>>> timedelta(hours=6) / 2
datetime.timedelta(0, 10800)
回答by Nadia Alramli
You can override the division operator like this:
您可以像这样覆盖除法运算符：
class MyTimeDelta(timedelta):
def __div__(self, value):
# Dome something about the object
