You major at merge cover report by jacoco.Both reports are for different versions of the same project.
Ваша основная задача — объединить отчеты о покрытии кода, созданные Jacoco. Оба отчета предназначены для разных версий кода одного и того же проекта. Эти два файла соответствуют файлам двух входных отчетов report1 и report2.
Вот код о том, как это сделать:

def same_line_fc(report1,report2):
    # report2 is nearly cover report
    # comparte two coverage reports.You find line number of the same line  that the the html class is nc in report2 and fc in report1.
    # the line number of report2 append to a list 
    # the same line is the same java code,not the line number.
    #the line number append to a list
    

def merge_coverage_reports(report1, report2):
    # Merge two coverage reports
    same_list_number = same_line_fc(report1, report2)
    # change report2's html the line in the same_list_number html class to fc.And return the new report2
    

print(merge_coverage_reports(report1, report2))

from bs4 import BeautifulSoup

def same_line_fc(report1_content, report2_content):
    soup1 = BeautifulSoup(report1_content, 'html.parser')
    soup2 = BeautifulSoup(report2_content, 'html.parser')

    # Получить все строки
    lines1 = soup1.find_all('span', class_='fc')
    lines2 = soup2.find_all('span', class_='nc')

    same_line_numbers = []

    # Создайте словарь для сохранения каждой строки кода и соответствующего номера строки.
    lines_dict1 = {line.get_text(): line['id'] for line in lines1}
    lines_dict2 = {line.get_text(): line['id'] for line in lines2}

    # Найдите строку fc в отчете1 и nc в отчете2.
    for code_line, line_id in lines_dict1.items():
        if code_line in lines_dict2:
            same_line_numbers.append(lines_dict2[code_line].replace('L', ''))

    return same_line_numbers

def merge_coverage_reports(report1_content, report2_content):
    same_list_number = same_line_fc(report1_content, report2_content)
    
    soup2 = BeautifulSoup(report2_content, 'html.parser')
    
    # Измените класс соответствующей строки в отчете2.
    for line_number in same_list_number:
        line_span = soup2.find('span', id=f'L{line_number}')
        if line_span:
            line_span['class'] = 'fc'
    
    return str(soup2)

# Чтение содержимого HTML-файла
with open('./to/report1.html', 'r', encoding='utf-8') as file1:
    report1_content = file1.read()

with open('./to/report2.html', 'r', encoding='utf-8') as file2:
    report2_content = file2.read()

# Консолидированная отчетность
merged_report_content = merge_coverage_reports(report1_content, report2_content)

# Вывод объединенного отчета
output_path = './to/merged_report.html'
with open(output_path, 'w', encoding='utf-8') as file_out:
    file_out.write(merged_report_content)

print(f"Merged report saved to {output_path}")