python - Python 中 'wb' 文件模式下的 FileNotFoundError？

Question

我正在尝试编写一个程序来下载所有 xkcd 漫画图像并将它们保存在一个目录中，所有图像名称为 title.png，title 是漫画的标题。这是它的代码:

#Downloads all the xkcd comics

import requests, bs4, os

site = requests.get('https://www.xkcd.com')

def downloadImage(site):
    soup = bs4.BeautifulSoup(site.text)
    img_tag = soup.select('div[id="comic"] img')
    img_title = img_tag[0].get('alt')
    img_file = open(img_title+'.png', 'wb')
    print("Downloading %s..." %img_title)
    img_res = requests.get("https:" +  img_tag[0].get('src'))
    for chunk in img_res.iter_content(100000):
        img_file.write(chunk)
    print("Saved %s in " %img_title, os.getcwd())


def downloadPrevious(site):
    soup = bs4.BeautifulSoup(site.text)
    prev_tag_list = soup.select("ul[class='comicNav'] li > a")
    prev_tag = None
    for each in prev_tag_list:
        if(each.get('rel')==['prev']):
            prev_tag = each
            break
    if(prev_tag.get('href') == '#'):
        return True
    prev_site = requests.get('https://xkcd.com' + prev_tag.get('href'))
    downloadImage(prev_site)
    return False, prev_site

def download_XKCD_Comics(site):
    try:
        os.makedirs('E:\\XKCD Comics')
    except:
        os.chdir('E:\XKCD Comics')

    done = False
    downloadImage(site)
    while(not done):
        done, site = downloadPrevious(site)
    return

download_XKCD_Comics(site)

代码的输出:

==== RESTART: E:\Computer_Science_Programs\Python\Get all XKCD Comics.py ====
Downloading Data Pipeline...
Saved Data Pipeline in  E:\XKCD Comics
Downloading Incoming Calls...
Saved Incoming Calls in  E:\XKCD Comics
Downloading Stanislav Petrov Day...
Saved Stanislav Petrov Day in  E:\XKCD Comics
Downloading Bad Opinions...
Saved Bad Opinions in  E:\XKCD Comics
Traceback (most recent call last):
  File "E:\Computer_Science_Programs\Python\Get all XKCD Comics.py", line 45, in <module>
    download_XKCD_Comics(site)
  File "E:\Computer_Science_Programs\Python\Get all XKCD Comics.py", line 42, in download_XKCD_Comics
    done, site = downloadPrevious(site)
  File "E:\Computer_Science_Programs\Python\Get all XKCD Comics.py", line 30, in downloadPrevious
    downloadImage(prev_site)
  File "E:\Computer_Science_Programs\Python\Get all XKCD Comics.py", line 11, in downloadImage
    img_file = open(img_title+'.png', 'wb')
FileNotFoundError: [Errno 2] No such file or directory: '6/6 Time.png'
>>> 

我不明白这个问题。其他文件都不存在，但仅使用此文件名引发错误。请有人帮我解决这个问题!

Answer 1

我刚刚遇到一个问题，在 wb 模式下打开文件时出现 FileNotFoundError: [Errno 2] No such file or directory:，这让我很困惑，因为我认为使用 open 和 wb 应该创建文件(如果它不存在)。原来问题是我试图创建的文件位于一个不存在的目录中。轻松修复:

MNIST_DATA_DIRNAME = os.path.dirname(MNIST_DATA_FILENAME)
if not os.path.isdir(MNIST_DATA_DIRNAME):
    os.makedirs(MNIST_DATA_DIRNAME)

with open(MNIST_DATA_FILENAME, "wb") as f:
    f.write(b)