Timedelta与python中的float相乘

问题描述：

我有两个日期，可以像往常一样计算timedelta。

I have two dates and can calculate timedelta as usual.

但是我想计算得到的timedelta的百分比：

But I want to calculate some percent with resulting timedelta:

full_time = (100/percentage) * timdelta

但是看来它只能与interegs相乘。

But it seems that it can only multiplying with interegs.

如何使用 float 代替 int 作为乘数？

How can I use float instead of int as multiplier?

示例：

percentage     = 43.27
passed_time    = fromtimestamp(fileinfo.st_mtime) - fromtimestamp(fileinfo.st_ctime)
multiplier     = 100 / percentage   # 2.3110700254217702796394730760342
full_time      = multiplier * passed_time # BUG: here comes exception
estimated_time = full_time - passed_time

如果使用了 int（乘数） —准确性受到影响。

If is used int(multiplier) — accuracy suffers.

答

您可以转换为总秒数，然后再次返回：

You can convert to total seconds and back again:

full_time = timedelta(seconds=multiplier * passed_time.total_seconds())

timedelta.total_seconds 可从Python 2.7获得；在早期版本上使用

timedelta.total_seconds is available from Python 2.7; on earlier versions use

def timedelta_total_seconds(td):
    return (td.microseconds + (td.seconds + td.days * 24 * 3600) * 10**6) / float(10**6)

Timedelta与python中的float相乘

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