Python Pandas - 計算給定當前索引的新索引的索引器和掩碼
要計算給定當前索引的新索引的索引器和掩碼,請在 Pandas 中使用 index.get_indexer() 方法。
首先,匯入所需的庫 −
import pandas as pd
建立 Pandas 索引 −
index = pd.Index([10, 20, 30, 40, 50, 60, 70])
顯示 Pandas 索引 −
print("Pandas Index...\n",index)
計算索引器和掩碼。用 -1 標記,因為它不在索引中 −
print("\nGet the indexes...\n",index.get_indexer([30, 40, 90, 100, 50]))
示例
以下是程式碼 −
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) # Compute indexer and mask # Marked by -1, as it is not in index print("\nGet the indexes...\n",index.get_indexer([30, 40, 90, 100, 50]))
輸出
這會產生以下輸出 −
Pandas Index... Int64Index([10, 20, 30, 40, 50, 60, 70], dtype='int64') Number of elements in the index... 7 Get the indexes... [ 2 3 -1 -1 4]
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