import pandas as pd
# 创建示例 DataFrame A
dataA = {'ID': [1, 2, 3, 4],
'Category': ['A', 'B', 'A', 'C']}
dfA = pd.DataFrame(dataA)
# 创建示例 DataFrame B
dataB = {'ID': [1, 2, 3, 4],
'Value': [100, 200, 300, 400]}
dfB = pd.DataFrame(dataB)
# 根据 DataFrame A 中 'Category' 列的值筛选 DataFrame B
category_to_select = 'A'
filtered_dfB = dfB[dfB['ID'].isin(dfA[dfA['Category'] == category_to_select]['ID'])]
# 打印筛选后的 DataFrame B
print(filtered_dfB)
标签：Category,dfA,DataFrame,pd,筛选,数据,ID,dfB From： https://www.cnblogs.com/nicole-zhang/p/17613992.html