将txt文件合并为一个文件，保留不同文件中副本的最新行

def merge_txt_files(file_list, output_file):
    merged_lines = {}

    # Read lines from each file and save the latest lines
    for file_path in file_list:
        with open(file_path, 'r') as file:
            for line in file:
                line = line.strip()
                if line in merged_lines:
                    # Compare date and update line if necessary
                    if get_date(line) > get_date(merged_lines[line]):
                        merged_lines[line] = line
                else:
                    merged_lines[line] = line

    # Write merged lines to the output file
    with open(output_file, 'w') as file:
        for line in merged_lines.values():
            file.write(line + '\n')

# Example usage
file_list = ['file1.txt', 'file2.txt', 'file3.txt']
output_file = 'merged.txt'
merge_txt_files(file_list, output_file)