Python Pandas - 计算每个组中的行数
pythonserver side programmingprogramming更新于 2025/11/5 9:16:17
使用 group.size() 计算每个组中的行数。导入所需的库 −
import pandas as pd
创建 DataFrame −
dataFrame = pd.DataFrame({'Product Category': ['Computer', 'Mobile Phone', 'Electronics', 'Electronics', 'Computer', 'Mobile Phone'],'Quantity': [10, 50, 10, 20, 25, 50],'Product Name': ['Keyboard', 'Charger', 'SmartTV', 'Camera', 'Graphic Card', 'Earphone']
})
按列分组 −
dataFrame.groupby(["产品类别", "数量"])
现在，计算组大小以获取每个组中的行数。
示例
以下是完整代码 −
import pandas as pd
# create a dataframe
dataFrame = pd.DataFrame({'Product Category': ['Computer', 'Mobile Phone', 'Electronics', 'Electronics', 'Computer', 'Mobile Phone'],'Quantity': [10, 50, 10, 20, 25, 50],'Product Name': ['Keyboard', 'Charger', 'SmartTV', 'Camera', 'Graphic Card', 'Earphone']
})
# dataframe
print"Dataframe...\n",dataFrame
# grouping columns
new_group = dataFrame.groupby(["Product Category", "Quantity"])
# group size
new_group = new_group.size()
# dataframe
print"\nUpdated Dataframe...\n",new_group
输出
这将产生以下输出 −
Dataframe... Product Category Product Name Quantity 0 Computer Keyboard 10 1 Mobile Phone Charger 50 2 Electronics SmartTV 10 3 Electronics Camera 20 4 Computer Graphic Card 25 5 Mobile Phone Earphone 50 Updated Dataframe... Product Category Quantity Computer 10 1 25 1 Electronics 10 1 20 1 Mobile Phone 50 2 dtype: int64
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python 参考教程 - 该教程包含有关 python 的更多信息:https://www.cainiaomax.com/python/
