Python Pandas - 如果索引中所有标签都比已传递标签晚,则从索引返回标签
要从索引中返回标签(如果索引中的所有标签都比已传递的标签晚),请在 Pandas 中使用 index.asof() 方法。
首先,导入必需的库 -
import pandas as pd
创建 Pandas 索引 -
index = pd.Index([10, 20, 30, 40, 50, 60, 70])
显示 Pandas 索引 -
print("Pandas Index...\n",index)
从索引中返回标签。如果索引中的所有标签都比已传递的标签晚,则返回 NaN -
print("\nGet the label from the index...\n",index.asof(6))
示例
以下是代码 -
import pandas as pd # Creating Pandas index index = pd.Index([10, 20, 30, 40, 50, 60, 70]) # Display the Pandas index print("Pandas Index...\n",index) # Return the number of elements in the Index print("\nNumber of elements in the index...\n",index.size) # Return the label from the index # Returns NaN when if all of the labels in the index are later than the passed label print("\nGet the label from the index...\n",index.asof(6))
输出
这将生成以下输出 -
Pandas Index... Int64Index([10, 20, 30, 40, 50, 60, 70], dtype='int64') Number of elements in the index... 7 Get the label from the index... Nan
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