推荐学习书目
› Learn Python the Hard Way
Python Sites
› PyPI - Python Package Index
› http://diveintopython.org/toc/index.html
› Pocoo
值得关注的项目
› PyPy
› Celery
› Jinja2
› Read the Docs
› gevent
› pyenv
› virtualenv
› Stackless Python
› Beautiful Soup
› 结巴中文分词
› Green Unicorn
› Sentry
› Shovel
› Pyflakes
› pytest
Python 编程
› pep8 Checker
Styles
› PEP 8
› Google Python Style Guide
› Code Style from The Hitchhiker's Guide
chaneyccy
V2EX  ›  Python

新人求解: Python 写入 txt 时数据丢失的问题

  •  1
     
  •   chaneyccy · Jan 14, 2020 · 4432 views
    This topic created in 2492 days ago, the information mentioned may be changed or developed.

    主要问题在这:

    for txt in list_: txts = txt.get_text() #在这里 print(txts), 结果还是完整的 download_run(title1, title2, title3, title4, txts) #在这里 print(txts), 数据只剩最后一个段落了

    代码如下: def download(href_urls): for url in href_urls: mod_titles = [] ses = requests.session() html = ses.get(url, headers = header(), verify = False) soup = BeautifulSoup(html.content, 'html.parser') title_list = soup.find(class_ = 'g-ctnBar').find_all('a') title1 = title_list[2].get_text() title2 = title_list[3].get_text() title3 = title_list[4].get_text() title4 = title_list[5].get_text() list_ = soup.find_all('div', class_ = 'detail-mod J_floor')[:-3] for txt in list_: txts = txt.get_text() download_run(title1, title2, title3, title4, txts)

    def download_run(title1, title2, title3, title4, txts): path = 'C:/Users/Desktop/run/%s/%s/%s' %(title1, title2, title3) if not os.path.exists(path): os.makedirs(path) with open('C:/Users/Desktop/run/%s/%s/%s/%s.txt' %(title1, title2, title3, title4), 'w')as f: f.write(txts)

    18 replies  •  2020-01-15 12:03:16 +08:00
    chaneyccy
    chaneyccy
    OP
    Jan 14, 2020
    1
    排版有点乱,更新一下

    def download(href_urls):

    for url in href_urls:

    mod_titles = []

    ses = requests.session()

    html = ses.get(url, headers = header(), verify = False)

    soup = BeautifulSoup(html.content, 'html.parser')

    title_list = soup.find(class_ = 'g-ctnBar').find_all('a')

    title1 = title_list[2].get_text()

    title2 = title_list[3].get_text()

    title3 = title_list[4].get_text()

    title4 = title_list[5].get_text()

    list_ = soup.find_all('div', class_ = 'detail-mod J_floor')[:-3]

    for txt in list_:

    txts = txt.get_text()

    download_run(title1, title2, title3, title4, txts)


    def download_run(title1, title2, title3, title4, txts):

    path = 'C:/Users/Desktop/run/%s/%s/%s' %(title1, title2, title3)

    if not os.path.exists(path):

    os.makedirs(path)

    with open('C:/Users/Desktop/run/%s/%s/%s/%s.txt' %(title1, title2, title3, title4), 'w')as f:

    f.write(txts)
    JCZ2MkKb5S8ZX9pq
    JCZ2MkKb5S8ZX9pq
    Jan 14, 2020 via iPhone
    2
    ```
    你的代码
    ```

    这样可以保留模式。回复时无效。详情可查 markdown 格式。
    JCZ2MkKb5S8ZX9pq
    JCZ2MkKb5S8ZX9pq
    Jan 14, 2020 via iPhone
    3
    格式
    chaneyccy
    chaneyccy
    OP
    Jan 14, 2020
    4
    @JCZ2MkKb5S8ZX9pq 好的,平时没有用 markdown 写内容的习惯~ 我去研究下
    cxyfreedom
    cxyfreedom
    Jan 14, 2020
    5
    你遍历循环又每次写入,你循环完成后,txts 本来就只有一部分的数据,写入到文件中当然就只有最后一部分。
    Vegetable
    Vegetable
    Jan 14, 2020❤️1
    7
    @cxyfreedom #5 代码我读了,是因为每次都 open(file,'w')写入的原因。
    Wuuuu
    Wuuuu
    Jan 14, 2020
    8
    感觉应该是 txts = txts+"\n"+txt.get_txt()?
    Wuuuu
    Wuuuu
    Jan 14, 2020
    9
    @Vegetable py 靠缩进……这样的不知道到底是
    for txt in list_:

    txts = txt.get_text()

    download_run(title1, title2, title3, title4, txts)

    还是
    for txt in list_:

    txts = txt.get_text()

    download_run(title1, title2, title3, title4, txts)

    但大概率是第二种写法吧。
    Wuuuu
    Wuuuu
    Jan 14, 2020
    10
    for txt in list_:

    \t txts = txt.get_text()

    \t download_run(title1, title2, title3, title4, txts)

    for txt in list_:

    \t txts = txt.get_text()

    download_run(title1, title2, title3, title4, txts)
    sDG9xz87SqqCC3mN
    sDG9xz87SqqCC3mN
    Jan 14, 2020
    11
    把 w 改成 a
    zhejiangblue
    zhejiangblue
    Jan 14, 2020
    12
    打开模式用 a,w 会重新创建文件的
    chaneyccy
    chaneyccy
    OP
    Jan 14, 2020
    13
    @Vegetable 感谢感谢,之前把从'a'改成'w'了,没考虑到这个原因,调回来正常了
    cxyfreedom
    cxyfreedom
    Jan 14, 2020
    14
    @Vegetable 如果 for 循环下面的话那就是这个问题。追加写入不能用 w。按这个代码逻辑不如一次性写入呢
    JCZ2MkKb5S8ZX9pq
    JCZ2MkKb5S8ZX9pq
    Jan 14, 2020 via iPhone
    16
    如果是 aw 的问题 建议拼接 txt 然后 w
    a 万一重复执行会重复写入
    cherbim
    cherbim
    Jan 14, 2020
    17
    你文件写入的是 w,每次都会重写,用 a 追加啊
    shunfa52000
    shunfa52000
    Jan 15, 2020
    18
    上次我程序结尾没有加 f.close,结果循环次数多的时候报错了
    About   ·   Help   ·   Advertise   ·   Blog   ·   API   ·   FAQ   ·   Privacy   ·   Solana   ·   2444 Online   Highest 6679   ·     Select Language
    创意工作者们的社区
    World is powered by solitude
    VERSION: 3.9.8.5 · 35ms · UTC 12:29 · PVG 20:29 · LAX 04:29 · JFK 07:29
    ♥ Do have faith in what you're doing.