本文主要是介绍合并两个文本文件的内容，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
1. 需求
把两个文本文件的内容合并到一个文件中，且并不要求文件中行的顺序保持不变。
且适用于两个文本文件中有较多的数据是完全一样的，仅存在少量不一致的地方。
2. 方案
因为两个文本文件中的存在
把两个文件的内容读到list中，然后再转换成set类型，最后取并集即可。
3. 实现代码
def merge_text_file(first_filename, second_filename, merged_filename):'''Merge two text files, the sequence of two file's content maybe changed.example: source_file_1 = "a.txt" source_file_2 = "b.txt"merged_file = "merged.txt"merge_text_file(source_file_1, source_file_2, merged_file)'''first_list = open(first_filename, 'r').read().split('\n')second_list = open(second_filename, 'r').read().split('\n')result_set = set(first_list) | set(second_list)result_list = list(result_set)result_list.sort()result_file = open(merged_filename, "w")for item in result_list:temp = item.strip()if temp == "": continueresult_file.write(temp + '\n')result_file.close()
4. 使用示例
import file_utilitiesdef _write_temp_file(filename, values):f = open(filename, "w")for value in values:f.write(value + '\n')f.close()def _test():first_values = ["first", "second"]second_values = ["first", "third"]first_filename = "first_abcdefghijklmn.xyz"second_filename = "second_abcdefghijklmn.xyz"merged_filename = "merged_abcdefghijklmn.xyz"_write_temp_file(first_filename, first_values)_write_temp_file(second_filename, second_values)file_utilities.merge_text_file(first_filename, second_filename, merged_filename)# assert the resultresult = open(merged_filename, "r").read().split('\n')result.remove('')print "result:", resultresult = set(result)expected_result = set(['first', 'second', 'third'])print "expected result:", expected_resultif result == expected_result:print "PASS"else:print "FAIL"if __name__ == '__main__':_test()运行结果：
D:\examples\python\file_utilities>python test_merge_text_file.py
result: ['first', 'second', 'third']
expected result: set(['second', 'third', 'first'])
PASSD:\examples\python\file_utilities>
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