Pandas将系列从DateTimeStamp转换为datetime.datetime对象

Question

我有一只大熊猫＆＃39;具有数据类型为datetime64[ns]的列的数据框。

如何将整个系列转换为Python的Datetime.datetime对象？在单个对象上有一个名为to_datetime()的函数，但我无法在该系列上调用此函数。

谢谢

Answer 1

如果考虑到性能，我建议使用以下函数将这些列转换为date_time：

def lookup(s):
    """
    This is an extremely fast approach to datetime parsing.
    For large data, the same dates are often repeated. Rather than
    re-parse these, we store all unique dates, parse them, and
    use a lookup to convert all dates.
    """
    dates = {date:pd.to_datetime(date) for date in s.unique()}
    return s.apply(lambda v: dates[v])

to_datetime: 5799 ms
dateutil:    5162 ms
strptime:    1651 ms
manual:       242 ms
lookup:        32 ms