此解决方案一次性读取两个文件，排除空白行，并打印公共行，无论它们在文件中的位置如何：
with open('some_file_1.txt', 'r') as file1:
with open('some_file_2.txt', 'r') as file2:
same = set(file1).intersection(file2)
same.discard('\n')
with open('some_output_file.txt', 'w') as file_out:
for line in same:
file_out.write(line)
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