如何用inbuild对象替换文件

Question

我有工作脚本：

#argument passed to the script in order to indicate which item should be processed
searchedItem = sys.argv[1]

#get list of items with its details via REST API in json format
response = requests.get('http://localhost...')
vJsonStr = response.text

#convert json schema into summary list with names and ids only
fTxt = open(filepathTxt, 'w')
vJson = json.loads(vJsonStr)

for r in vJson['items']:
    fTxt.write (r[ 'name' ] + ' ' + r[ 'id' ] + ' \n')
fTxt.close()

#check whether argument passed is covered by the list saved
file = open(filepathTxt, 'r')
content = file.read()

if searchedItem in content:
        with open (filepathTxt, 'r') as file:
            for line in file:
                if searchedItem in line:
                    wantedLine = line.split(' ')
                    ItemName = wantedLine[0]
                    ItemId = wantedLine[1]
    else:
         print('WARNING: ...')

我的问题是: 如何用内置Python对象替换fTxt文件，这样我就可以摆脱文件并获得相同的最终结果？
下面表格中的fTxt文件允许我按项目搜索，并返回相应的id该练习的目的是什么。
第1项id1
第2项id2
项目3 id3

我应该使用口述还是列表？ 如果有，应如何定义和更新/追加