Python Pandas - 返回 Index 对象中的唯一元素数
要返回 Index 对象中唯一元素的数量,请在 Pandas 中使用 index.nunique() 方法。首先,导入所需的库 −
import pandas as pd
创建 Pandas 索引 −
index = pd.Index([50, 10, 70, 110, 90, 50, 110, 90, 30])
显示 Pandas 索引 −
print("Pandas Index...\n",index)
获取索引中唯一值的数目 −
print("\nCount of unique values...\n",index.nunique())
示例
下面是代码 −
import pandas as pd # Creating Pandas index index = pd.Index([50, 10, 70, 110, 90, 50, 110, 90, 30]) # 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 dtype of the data print("\nThe dtype object...\n",index.dtype) # Get the unique values from the index # Unique values are returned in order of appearance, this does NOT sort print("\nUnique values from the Index..\n", index.unique()) # Get the number of unique values in the index print("\nCount of unique values...\n",index.nunique())
输出
将生成以下输出 −
Pandas Index... Int64Index([50, 10, 70, 110, 90, 50, 110, 90, 30], dtype='int64') Number of elements in the index... 9 The dtype object... int64 Unique values from the Index.. Int64Index([50, 10, 70, 110, 90, 30], dtype='int64') Count of unique values... 6
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