python3实现指定目录下文件sha256及文件大小统计

import osimport sysimport hashlib def Usage(): ''' usage description ''' num = len(sys.argv) if num != 3: print("Error: please input two parameters") print("for example: {} path_name save_file_name".format(sys.argv[0])) sys.exit(1) def GetFilesList(): ''' get file list ''' input_path_name = sys.argv[1] result = list()  for dirpath, dirnames, filenames in os.walk(input_path_name, followlinks=True): for filename in filenames:  file_path = os.path.join(dirpath, filename)  result.append(file_path)  result.sort() return result def CalcFileSha256(filname): ''' calculate file sha256 ''' with open(filname, "rb") as f: sha256obj = hashlib.sha256() sha256obj.update(f.read()) hash_value = sha256obj.hexdigest() return hash_value def CalcFileSize(filename): ''' calculate file size ''' return os.stat(filename).st_size def GetFileContent(): ''' get file contnet ''' files_list = GetFilesList() result = list()  for f in files_list: hash = CalcFileSha256(f) size = CalcFileSize(f) file_name = os.path.basename(os.path.realpath(f)) path_name = os.path.dirname(os.path.realpath(f)) dictionary = {"path": path_name, "filename": file_name, "sha256": hash, "size": size} #print("result: {}".format(dictionary)) result.append(dictionary) return result def WriteToFile(contents): ''' write content to the specified file ''' fp = open(sys.argv[2], "w")  for content in contents: #print("content:", content) str0 = str(content) str1 = str0.replace("////", "/") fp.write(str1) fp.write("/n") fp.close() def ReplaceStr(src_str, new_str): ''' replace source string with new string ''' contents = list()  fp = open(sys.argv[2], "r") line = fp.readline() while line: contents.append(line) line = fp.readline() fp.close()  fp = open(sys.argv[2], "w") for content in contents: str0 = content.replace(src_str, new_str) fp.write(str0) fp.close() def main(): Usage() WriteToFile(GetFileContent()) ReplaceStr(" ", "") ReplaceStr("'", "/"") if __name__ == "__main__": main()