munging

Useful data processing functions.

wechinelearn.munging.get_dayseconds(dt)

Returns the number of seconds behind the most recent midnight.

For example: get_dayseconds(datetime(2016, 9, 12, 1, 2, 3)) => 3723.

wechinelearn.munging.get_weekseconds(dt)

Returns the number of seconds behind the most recent midnight of a Monday.

For example: get_weekseconds(datetime(2016, 9, 12, 0, 5, 0)) => 300.0. Because 2016-09-12 is a Monday, and 5 minutes is 300 seconds.

wechinelearn.munging.difference(array, n=1)

Return the differentiation of and array. By default it’s 1-order.

For example we have array = [a1, a2, ... , a10]. Then we have difference(array, 1) => [(a2 - a1), (a3 - a2), ... (a10 - a9)] difference(array, 2) => [(a3 - a1), (a4 - a2), ... (a10 - a8)]

If any error is raised, replace it with None.

中文文档

差分计算函数。在差分的过程中如果有任何异常出现, 则用None代替。