tz_localize AmbigouslyTimeError:无法用非 DST 日期推断 dst 时间

问题描述 投票:0回答:1

我正在尝试导入一些时间序列数据并将其转换为 UTC,以便我可以将其与另一个数据集合并。该数据似乎有24小时数据,并且没有DST调整。 Python pandas tz_localize 抛出 NonExistentTimeError,然后无法删除错误时间 给出了类似的答案,但他们只是简单地删除了该行。我需要移动它,以便我可以将它与我的其他数据合并。

当我运行代码时:

df = pd.read_csv('http://rredc.nrel.gov/solar/old_data/nsrdb/1991-2010/data/hourly/{}/{}_{}_solar.csv'.format(723898,723898,1998), usecols=["YYYY-MM-DD", "HH:MM (LST)","Meas Glo (Wh/m^2)","Meas Dir (Wh/m^2)","Meas Dif (Wh/m^2)"])

def clean_time(obj):
    hour = int(obj[0:-3])
    hour = str(hour - 1)
    if len(str(hour)) == 2:
        return hour+":00"
    else:
        return "0" + hour + ":00"

df['HH:MM (LST)'] = df['HH:MM (LST)'].apply(clean_time)
df['DateTime'] = df['YYYY-MM-DD'] + " " + df['HH:MM (LST)']
df = df.set_index(pd.DatetimeIndex(df['DateTime']))
df.drop(["YYYY-MM-DD", "HH:MM (LST)",'DateTime'],axis=1,inplace=True)
df.index = df.index.tz_localize('US/Pacific', ambiguous='infer')

我得到:

pytz.exceptions.AmbiguousTimeError: Cannot infer dst time from 1998-10-25 01:00:00 as there are no repeated times

如果我留下 ambigitude='raise' (默认值),它会给我:

pytz.exceptions.NonExistentTimeError: 1998-04-05 02:00:00

所以我被困在夏令时的开始或结束时间。

我需要合并相当多的这些数据集(多年来的多个站点),所以我不想手动编写特定时间的代码来进行轮班。

python pandas timezone dst
1个回答
12
投票

最小重现场景:

from datetime import datetime, timedelta

import pandas as pd


df = pd.DataFrame([[datetime(2019, 10, 27, 0) + timedelta(hours=i), i] for i in range(24)], columns=['dt', 'i']).set_index('dt')
df.index.tz_localize('Europe/Amsterdam', ambiguous='infer')

pytz.exceptions.AmbigouslyTimeError:无法推断 2019-10-27 02:00:00 的夏令时,因为没有重复时间

解决方案:手动指定哪些日期时间对象必须被视为DT(夏令时)或DST(夏令时)。请参阅文档

from datetime import datetime, timedelta
import numpy as np
import pandas as pd


df = pd.DataFrame([[datetime(2019, 10, 27, 0) + timedelta(hours=i), i] for i in range(24)], columns=['dt', 'i']).set_index('dt')
infer_dst = np.array([False] * df.shape[0])  # all False -> every row considered DT, alternative is True to indicate DST. The array must correspond to the iloc of df.index
df.index.tz_localize('Europe/Amsterdam', ambiguous=infer_dst)  # no error
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