如何将NumPy datetime64转换为长整数并进行反向转换?
产生错误:
import numpy as np
import datetime
np.datetime64(datetime.datetime.now()).astype(long)
给出了一个值为1511975032478959
np.datetime64(np.datetime64(datetime.datetime.now()).astype(long))
产生错误:
ValueError: Converting an integer to a NumPy datetime requires a specified unit