blocks|key|1813162|text|add_argument的第二个参数是参数的“长名称”。对于第一个参数，您将传递--urls，然后argparse将使用户传递的值作为args["urls"]可用|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1813163|#+...
ap.add_argument("-u",+"--urls",+type=str,
++++++++++++++++required=False,+help="path+containing+URLs")|code-block|syntax|javascript|1813164|然后，在命令行中，传入参数：|1813165|python+imagescraping.py+--urls+C:/Users/artus/datasets/urls.txt|1813166|此外，我认为您不需要将其包装在vars中。|1813167|entityMap^0|14|6|1V|C|0|0|0|0|F|4|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|R|$]]

The second parameter of add_argument is the "long name" for the argument. For the first argument, you'll be passing <code>--urls</code>, and then argparse will make the value the user passes available as <code>args["urls"]</code>:

<pre><code># ...
ap.add_argument("-u", "--urls", type=str,
 required=False, help="path containing URLs")
</code></pre>

Then, at the command line, pass in the argument:

<pre><code>python imagescraping.py --urls C:/Users/artus/datasets/urls.txt
</code></pre>

Also, I don't think you need to wrap it in <code>vars</code>.

blocks|key|1598878|text|当我将argparse代码复制-n-粘贴到脚本时：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1598879|import+argparse
ap+=+argparse.ArgumentParser()
ap.add_argument("-u",+"--C:/Users/artus/datasets/urls.txt",+
++++++++++++++++required=False,+help="path+containing+URLs")
ap.add_argument("-o",+"--C:/Users/artus/datasets/ShoesImage",+
++++++++++++++++required=False,+help="folder+for+downloaded+images")
args+=+ap.parse_args()
print(args)|code-block|syntax|javascript|1598880|不带参数地调用它：|1598881|0923:~/mypy$+python3+stack56745387.py+
Namespace(**{'C:/Users/artus/datasets/ShoesImage':+None,+'C:/Users/artus/datasets/urls.txt':+None})|1598882|并寻求帮助：|1598883|1743:~/mypy$+python3+stack56745387.py+-h
usage:+stack56745387.py+[-h]+[-u+C:/USERS/ARTUS/DATASETS/URLS.TXT]
++++++++++++++++++++++++[-o+C:/USERS/ARTUS/DATASETS/SHOESIMAGE]

optional+arguments:
++-h,+--help++++++++++++show+this+help+message+and+exit
++-u+C:/USERS/ARTUS/DATASETS/URLS.TXT,+--C:/Users/artus/datasets/urls.txt+C:/USERS/ARTUS/DATASETS/URLS.TXT
++++++++++++++++++++++++path+containing+URLs
++-o+C:/USERS/ARTUS/DATASETS/SHOESIMAGE,+--C:/Users/artus/datasets/ShoesImage+C:/USERS/ARTUS/DATASETS/SHOESIMAGE
++++++++++++++++++++++++folder+for+downloaded+images|1598884|您可能希望"--C:/Users/artus/datasets/urls.txt“类似于默认值，但您将其定义为long标志和参数的dest。(设置中没有将urls指定为所需的dest或密钥。)|offset|length|style|CODE|1598885|你必须使用它作为：|1598886|1750:~/mypy$+python3+stack56745387.py+--C:/Users/artus/datasets/urls.txt+foobar
Namespace(**{'C:/Users/artus/datasets/ShoesImage':+None,+'C:/Users/artus/datasets/urls.txt':+'foobar'})|1598887|将代码更改为：|1598888|import+argparse
ap+=+argparse.ArgumentParser()
ap.add_argument("-u",+"--urls",+default="C:/Users/artus/datasets/urls.txt",+
++++++++++++++++required=False,+help="path+containing+URLs+(default:+%25(default)s)")
ap.add_argument("-o",+"--images",default="C:/Users/artus/datasets/ShoesImage",+
++++++++++++++++required=False,+help="folder+for+downloaded+images+(default:+%25(default)s)")
args+=+ap.parse_args()
print(args)

1802:~/mypy$+python3+stack56745387.py+-h
usage:+stack56745387.py+[-h]+[-u+URLS]+[-o+IMAGES]

optional+arguments:
++-h,+--help++++++++++++show+this+help+message+and+exit
++-u+URLS,+--urls+URLS++path+containing+URLs+(default:
++++++++++++++++++++++++C:/Users/artus/datasets/urls.txt)
++-o+IMAGES,+--images+IMAGES
++++++++++++++++++++++++folder+for+downloaded+images+(default:
++++++++++++++++++++++++C:/Users/artus/datasets/ShoesImage)
1803:~/mypy$+python3+stack56745387.py+--urls+foobar
Namespace(images='C:/Users/artus/datasets/ShoesImage',+urls='foobar')|1598889|现在，您可以使用args.urls或vars(args)['urls']。|1598890|entityMap^0|0|0|0|0|0|0|1T|4|25|4|2F|4|0|0|0|0|0|8|9|I|I|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|17|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|18|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|19|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|1A|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|1B|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|1C|8|@$Q|1D|R|1E|S|T]|$Q|1F|R|1G|S|T]|$Q|1H|R|1I|S|T]]|9|@]|A|$]]|$1|U|3|V|5|6|7|1J|8|@]|9|@]|A|$]]|$1|W|3|X|5|D|7|1K|8|@]|9|@]|A|$E|F]]|$1|Y|3|Z|5|6|7|1L|8|@]|9|@]|A|$]]|$1|10|3|11|5|D|7|1M|8|@]|9|@]|A|$E|F]]|$1|12|3|13|5|6|7|1N|8|@$Q|1O|R|1P|S|T]|$Q|1Q|R|1R|S|T]]|9|@]|A|$]]|$1|14|3|-4|5|6|7|1S|8|@]|9|@]|A|$]]]|15|$]]

When I copy-n-paste your argparse code to a script:

<pre><code>import argparse
ap = argparse.ArgumentParser()
ap.add_argument("-u", "--C:/Users/artus/datasets/urls.txt", 
 required=False, help="path containing URLs")
ap.add_argument("-o", "--C:/Users/artus/datasets/ShoesImage", 
 required=False, help="folder for downloaded images")
args = ap.parse_args()
print(args)
</code></pre>

and call it without arguments:

<pre><code>0923:~/mypy$ python3 stack56745387.py 
Namespace(**{'C:/Users/artus/datasets/ShoesImage': None, 'C:/Users/artus/datasets/urls.txt': None})
</code></pre>

and asking for help:

<pre><code>1743:~/mypy$ python3 stack56745387.py -h
usage: stack56745387.py [-h] [-u C:/USERS/ARTUS/DATASETS/URLS.TXT]
 [-o C:/USERS/ARTUS/DATASETS/SHOESIMAGE]

optional arguments:
 -h, --help show this help message and exit
 -u C:/USERS/ARTUS/DATASETS/URLS.TXT, --C:/Users/artus/datasets/urls.txt C:/USERS/ARTUS/DATASETS/URLS.TXT
 path containing URLs
 -o C:/USERS/ARTUS/DATASETS/SHOESIMAGE, --C:/Users/artus/datasets/ShoesImage C:/USERS/ARTUS/DATASETS/SHOESIMAGE
 folder for downloaded images
</code></pre>

You probably intended the "--C:/Users/artus/datasets/urls.txt" to be something like the default value, but you defined it as the long flag and <code>dest</code> for the argument. (Nothing in your setup specified <code>urls</code> as the desired <code>dest</code> or key.)

which you'd have to use as:

<pre><code>1750:~/mypy$ python3 stack56745387.py --C:/Users/artus/datasets/urls.txt foobar
Namespace(**{'C:/Users/artus/datasets/ShoesImage': None, 'C:/Users/artus/datasets/urls.txt': 'foobar'})
</code></pre>

Changing the code to:

<pre><code>import argparse
ap = argparse.ArgumentParser()
ap.add_argument("-u", "--urls", default="C:/Users/artus/datasets/urls.txt", 
 required=False, help="path containing URLs (default: %(default)s)")
ap.add_argument("-o", "--images",default="C:/Users/artus/datasets/ShoesImage", 
 required=False, help="folder for downloaded images (default: %(default)s)")
args = ap.parse_args()
print(args)

1802:~/mypy$ python3 stack56745387.py -h
usage: stack56745387.py [-h] [-u URLS] [-o IMAGES]

optional arguments:
 -h, --help show this help message and exit
 -u URLS, --urls URLS path containing URLs (default:
 C:/Users/artus/datasets/urls.txt)
 -o IMAGES, --images IMAGES
 folder for downloaded images (default:
 C:/Users/artus/datasets/ShoesImage)
1803:~/mypy$ python3 stack56745387.py --urls foobar
Namespace(images='C:/Users/artus/datasets/ShoesImage', urls='foobar')
</code></pre>

Now you could use <code>args.urls</code> or <code>vars(args)['urls']</code>.

I'm trying to write a program for scraping images to create datasets to use for neural networks, however I'm getting a few problems

here's the code:

<pre><code>from imutils import paths
import argparse
import requests
import cv2
import os

ap = argparse.ArgumentParser()
ap.add_argument("-u", "--C:/Users/artus/datasets/urls.txt", 
 required=False, help="path containing URLs")
ap.add_argument("-o", "--C:/Users/artus/datasets/ShoesImage", 
 required=False, help="folder for downloaded images")
args = vars(ap.parse_args())

# grab the list of URLs from the input file, then initialize the
# total number of images downloaded thus far
rows = open(args["urls"]).read().strip().split("\n")
total = 0
</code></pre>

when executed it should download all the images from the urls specified in the urls.txt file, however I'm getting this error:

<pre><code>Traceback (most recent call last):
 File "C:/Users/artus/untitled5/imagescraping.py", line 16, in &lt;module&gt;
 rows = open(args["urls"]).read().strip().split("\n")
KeyError: 'urls'
</code></pre>

How to solve this type of KeyError?

我正在尝试编写一个程序来抓取图像，以创建用于神经网络的数据集，但是我遇到了一些问题代码如下：from imutils import pathsimport argparseimport requestsimport cv2import osap = argparse.ArgumentParser()ap.add_arg...

问如何解决这种类型的KeyError？
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