要计算列值的计数,请使用count()方法。首先,导入所需的 Pandas 库 -
import pandas as pd
创建一个包含两列的 DataFrame -
dataFrame1 = pd.DataFrame( { "Car": ['BMW', 'Lexus', 'Audi', 'Tesla', 'Bentley', 'Jaguar'], "Units": [100, 150, 110, 80, 110, 90] } )
使用count()函数查找“单位”列值的计数-
print"Count of values of Units column from DataFrame1 = ",dataFrame1['Units'].count()
以同样的方式,我们计算了第二个DataFrame的计数。
以下是完整的代码 -
import pandas as pd # 创建 DataFrame1 dataFrame1 = pd.DataFrame( { "Car": ['BMW', 'Lexus', 'Audi', 'Tesla', 'Bentley', 'Jaguar'], "Units": [100, 150, 110, 80, 110, 90] } ) print"DataFrame1 ...\n",dataFrame1 # 查找特定列的值计数 print"Count of values of Units column from DataFrame1 = ",dataFrame1['Units'].count() # 创建 DataFrame2 dataFrame2 = pd.DataFrame( { "Product": ['TV', 'PenDrive', 'HeadPhone', 'EarPhone', 'HDD'], "Price": [8000, 500, 3000, 1500, 3000] } ) print"\nDataFrame2 ...\n",dataFrame2 # 查找所有列的值的计数 print"\nCount of column values from DataFrame2 = \n",dataFrame2.count()输出结果
这将产生以下输出 -
DataFrame1 ... Car Units 0 BMW 100 1 Lexus 150 2 Audi 110 3 Tesla 80 4 Bentley 110 5 Jaguar 90 Count of values of Units column from DataFrame1 = 6 DataFrame2 ... Price Product 0 8000 TV 1 500 PenDrive 2 3000 HeadPhone 3 1500 EarPhone 4 3000 HDD Count of column values from DataFrame2 = Price 5 Product 5 dtype: int64