Python-сообщество

 import pandas as pd
 
from collections import OrderedDict
from decimal import Decimal
 
compare_columns = ['Счет дебет', 'Счет получателя']
 
data = pd.read_excel('files/translations-408-2.xlsx', sheetname=0)
data = data[data.duplicated(compare_columns, keep=False)].copy(deep=True)
 
counter = OrderedDict()
sum_i, col_unique_i = [
    i for i, col in enumerate(data.keys()) if col in ('Счет получателя', 'Сумма')
]
for i in data.values:
    num_card, sum_ = i[col_unique_i], i[sum_i]
    counter[num_card] = counter.get(num_card, [0, 0])
    counter[num_card][0] += 1
    counter[num_card][1] += Decimal(sum_)
 
data['__Счет'] = pd.Series([i for i in counter.keys()])
data['__Кол-во дубликатов'] = pd.Series([i[0] for i in counter.values()])
data['__Сумма'] = pd.Series([i[1] for i in counter.values()])
 
print(data)

 data = data[data.duplicated(compare_columns, keep=False)]
data = pd.DataFrame(data.values.copy(), columns=data.columns.copy())

 sum_i, col_unique_i = [
    i for i, col in enumerate(data.keys()) if col in ('Счет получателя', 'Сумма')
]

 for i in data.values: