blocks|key|796390|text|我希望我正确理解了这个问题:当URL以string类型存储时，如何从服务器下载文件？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|796391|我下载文件并使用以下代码将其保存在本地：|796392|import+requests

url+=+'https://www.python.org/static/img/python-logo.png'
fileName+=+'D:\Python\dwnldPythonLogo.png'
req+=+requests.get(url)
file+=+open(fileName,+'wb')
for+chunk+in+req.iter_content(100000):
++++file.write(chunk)
file.close()|code-block|syntax|javascript|796393|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I hope I understood the question right, which is: how to download a file from a server when the URL is stored in a string type?

I download files and save it locally using the below code:

<pre><code>import requests

url = 'https://www.python.org/static/img/python-logo.png'
fileName = 'D:\Python\dwnldPythonLogo.png'
req = requests.get(url)
file = open(fileName, 'wb')
for chunk in req.iter_content(100000):
 file.write(chunk)
file.close()
</code></pre>

blocks|key|796522|text|每当我想要一些与requests请求相关的东西时，我都会使用HTTP包，因为它的接口非常容易上手：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|796523|首先，安装requests|796524|$+pip+install+requests|code-block|syntax|javascript|796525|然后是代码：|796526|from+requests+import+get++#+to+make+GET+request


def+download(url,+file_name):
++++#+open+in+binary+mode
++++with+open(file_name,+"wb")+as+file:
++++++++#+get+request
++++++++response+=+get(url)
++++++++#+write+to+file
++++++++file.write(response.content)|796527|entityMap^0|8|8|0|5|8|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|Y|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|Z|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|10|8|@]|D|@]|E|$K|L]]|$1|Q|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|R|$]]

I use <code>requests</code> package whenever I want something related to HTTP requests because its API is very easy to start with:

first, install <code>requests</code>

<pre><code>$ pip install requests
</code></pre>

then the code:

<pre><code>from requests import get # to make GET request


def download(url, file_name):
 # open in binary mode
 with open(file_name, "wb") as file:
 # get request
 response = get(url)
 # write to file
 file.write(response.content)
</code></pre>

blocks|key|580632|text|from+urllib+import+request

def+get(url):
++++with+request.urlopen(url)+as+r:
++++++++return+r.read()


def+download(url,+file=None):
++++if+not+file:
++++++++file+=+url.split('/')[-1]
++++with+open(file,+'wb')+as+f:
++++++++f.write(get(url))|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|580633|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>from urllib import request

def get(url):
 with request.urlopen(url) as r:
 return r.read()


def download(url, file=None):
 if not file:
 file = url.split('/')[-1]
 with open(file, 'wb') as f:
 f.write(get(url))
</code></pre>

blocks|key|580693|text|是的，requests确实是一个很好的包，可以用在与HTTP请求相关的东西中。但是我们需要注意传入数据的编码类型，下面是一个解释差异的示例|type|unstyled|depth|inlineStyleRanges|entityRanges|data|580694|from+requests+import+get

#+case+when+the+response+is+byte+array
url+=+'some_image_url'

response+=+get(url)
with+open('output',+'wb')+as+file:
++++file.write(response.content)


#+case+when+the+response+is+text
#+Here+unlikely+if+the+reponse+content+is+of+type+**iso-8859-1**+we+will+have+to+override+the+response+encoding
url+=+'some_page_url'

response+=+get(url)
#+override+encoding+by+real+educated+guess+as+provided+by+chardet
r.encoding+=+r.apparent_encoding

with+open('output',+'w',+encoding='utf-8')+as+file:
++++file.write(response.content)|code-block|syntax|javascript|580695|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Yes, definietly requests is great package to use in something related to HTTP requests. but we need to be careful with the encoding type of the incoming data as well below is an example which explains the difference

<pre><code>
from requests import get

# case when the response is byte array
url = 'some_image_url'

response = get(url)
with open('output', 'wb') as file:
 file.write(response.content)


# case when the response is text
# Here unlikely if the reponse content is of type **iso-8859-1** we will have to override the response encoding
url = 'some_page_url'

response = get(url)
# override encoding by real educated guess as provided by chardet
r.encoding = r.apparent_encoding

with open('output', 'w', encoding='utf-8') as file:
 file.write(response.content)

</code></pre>

blocks|key|796735|text|如果您使用的是Linux，那么可以通过python+shell使用Linux的wget模块。以下是示例代码片段|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|796736|import+os
url+=+'http://www.example.com/foo.zip'
os.system('wget+%25s'%25url)|code-block|syntax|javascript|796737|entityMap^0|13|4|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

If you are using Linux you can use the <code>wget</code> module of Linux through the python shell. Here is a sample code snippet
<pre><code>import os
url = 'http://www.example.com/foo.zip'
os.system('wget %s'%url)
</code></pre>

I am creating a program that will download a .jar (java) file from a web server, by reading the URL that is specified in the .jad file of the same game/application. I'm using Python 3.2.1

I've managed to extract the URL of the JAR file from the JAD file (every JAD file contains the URL to the JAR file), but as you may imagine, the extracted value is type() string. 

Here's the relevant function:

<pre><code>def downloadFile(URL=None):
 import httplib2
 h = httplib2.Http(".cache")
 resp, content = h.request(URL, "GET")
 return content

downloadFile(URL_from_file)
</code></pre>

However I always get an error saying that the type in the function above has to be bytes, and not string. I've tried using the URL.encode('utf-8'), and also bytes(URL,encoding='utf-8'), but I'd always get the same or similar error.

So basically my question is how to download a file from a server when the URL is stored in a string type?

Download file from web in Python 3

服务器

Python

Linux

我正在创建一个程序，它将通过读取在相同游戏/应用程序的.jad文件中指定的URL，从web服务器下载.jar (java)文件。我使用的是Python 3.2.1我已经设法从JAD文件中提取了JAR文件的URL (每个JAD文件都包含JAR文件的URL )，但是您可以想象到，提取的值是type()字符串。下面是相关函数...

问使用Python 3从web下载文件
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