如何获取满足特定条件的pandas列中的值的总和？

import pandas as pd

df = pd.DataFrame({'列名1': [值1, 值2, ...],
                   '列名2': [值1, 值2, ...],
                   ...
                  })

filtered_df = df[df['列名'] 条件]

total_sum = filtered_df['列名'].sum()

import pandas as pd

df = pd.DataFrame({'A': [1, 2, 3, 4, 5],
                   'B': [6, 7, 8, 9, 10],
                   'C': [11, 12, 13, 14, 15]
                  })

filtered_df = df[df['A'] > 2]
total_sum = filtered_df['B'].sum()

print(total_sum)