Python Pandas - 根据索引对象返回包含唯一值计数的序列
要从索引对象返回包含唯一值计数的序列,请在 Pandas 中使用 index.value_counts() 方法。
首先,导入必需的库 -
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)
唯一值计数 −
print("\nGet the count of unique values...\n",index.value_counts())
举例
以下是代码 −
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) # count of unique values print("\nGet the count of unique values...\n",index.value_counts())
输出
这将产生以下输出 −
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 Get the count of unique values... 50 2 110 2 90 2 10 1 70 1 30 1 dtype: int64
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