Python Pandas - 在 DateTimeIndex 中返回特定时间值对应的索引位置
要返回 DateTimeIndex 中特定时间值对应的索引位置,请使用 DateTimeIndex.indexer_at_time() 方法。
首先,导入所需的库 −
import pandas as pd
使用周期为 5、单位为 T(即分钟)创建 DatetimeIndex −
datetimeindex = pd.date_range('2021-10-30 02:30:50', periods=5, tz='Australia/Adelaide', freq='20T')
显示 DateTimeIndex −
print("DateTimeIndex...\n", datetimeindex)
显示特定时间(此处为 03:10:50)的值对应的索引位置 −
print("\nIndex locations of values at particular time of day...\n", datetimeindex.indexer_at_time('2021-10-30 03:10:50'))
示例
代码如下 −
import pandas as pd # DatetimeIndex with period 5 and frequency as T i.e. minutes # The timezone is Australia/Adelaide datetimeindex = pd.date_range('2021-10-30 02:30:50', periods=5, tz='Australia/Adelaide', freq='20T') # display DateTimeIndex print("DateTimeIndex...\n", datetimeindex) # display DateTimeIndex frequency print("\nDateTimeIndex frequency...\n", datetimeindex.freq) # display index locations of values at particular time of day i.e. 03:10:50 here print("\nIndex locations of values at particular time of day...\n", datetimeindex.indexer_at_time('2021-10-30 03:10:50'))
输出
这将生成以下代码 −
DateTimeIndex... DatetimeIndex(['2021-10-30 02:30:50+10:30', '2021-10-30 02:50:50+10:30', '2021-10-30 03:10:50+10:30', '2021-10-30 03:30:50+10:30', '2021-10-30 03:50:50+10:30'], dtype='datetime64[ns, Australia/Adelaide]', freq='20T') DateTimeIndex frequency... <20 * Minutes> Index locations of values at particular time of day... [2]
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