我有一个小工具,我用来从一个网站上下载一个MP3文件,然后构建/更新一个播客XML文件,我已经添加到iTunes。
创建/更新XML文件的文本处理是用Python编写的。但是,我在Windows .bat文件中使用wget来下载实际的MP3文件。我更喜欢用Python编写整个实用程序。
我努力寻找一种用Python实际下载该文件的方法,因此我使用了wget。
那么,如何使用Python下载文件呢?
我有一个小工具,我用来从一个网站上下载一个MP3文件,然后构建/更新一个播客XML文件,我已经添加到iTunes。
创建/更新XML文件的文本处理是用Python编写的。但是,我在Windows .bat文件中使用wget来下载实际的MP3文件。我更喜欢用Python编写整个实用程序。
我努力寻找一种用Python实际下载该文件的方法,因此我使用了wget。
那么,如何使用Python下载文件呢?
当前回答
你可以使用keras.utils。Get_file来做它:
from tensorflow import keras
path_to_downloaded_file = keras.utils.get_file(
fname="file name",
origin="https://www.linktofile.com/link/to/file",
extract=True,
archive_format="zip", # downloaded file format
cache_dir="/", # cache and extract in current directory
)
其他回答
使用urllib.request.urlopen ():
import urllib.request
with urllib.request.urlopen('http://www.example.com/') as f:
html = f.read().decode('utf-8')
这是使用库的最基本的方法,没有任何错误处理。您还可以执行更复杂的操作,例如更改头文件。
在Python 2中,该方法在urllib2中:
import urllib2
response = urllib2.urlopen('http://www.example.com/')
html = response.read()
另一种可能是使用内置的http.client:
from http import HTTPStatus, client
from shutil import copyfileobj
# using https
connection = client.HTTPSConnection("www.example.com")
with connection.request("GET", "/noise.mp3") as response:
if response.status == HTTPStatus.OK:
copyfileobj(response, open("noise.mp3")
else:
raise Exception("request needs work")
HTTPConnection对象被认为是“低级的”,因为它只执行一次所需的请求,并假设开发人员将对它或脚本进行子类化,以处理HTTP的细微差别。诸如请求之类的库倾向于处理更特殊的情况,例如自动跟随重定向等等。
Python 2/3的PabloG代码的改进版本:
#!/usr/bin/env python
# -*- coding: utf-8 -*-
from __future__ import ( division, absolute_import, print_function, unicode_literals )
import sys, os, tempfile, logging
if sys.version_info >= (3,):
import urllib.request as urllib2
import urllib.parse as urlparse
else:
import urllib2
import urlparse
def download_file(url, dest=None):
"""
Download and save a file specified by url to dest directory,
"""
u = urllib2.urlopen(url)
scheme, netloc, path, query, fragment = urlparse.urlsplit(url)
filename = os.path.basename(path)
if not filename:
filename = 'downloaded.file'
if dest:
filename = os.path.join(dest, filename)
with open(filename, 'wb') as f:
meta = u.info()
meta_func = meta.getheaders if hasattr(meta, 'getheaders') else meta.get_all
meta_length = meta_func("Content-Length")
file_size = None
if meta_length:
file_size = int(meta_length[0])
print("Downloading: {0} Bytes: {1}".format(url, file_size))
file_size_dl = 0
block_sz = 8192
while True:
buffer = u.read(block_sz)
if not buffer:
break
file_size_dl += len(buffer)
f.write(buffer)
status = "{0:16}".format(file_size_dl)
if file_size:
status += " [{0:6.2f}%]".format(file_size_dl * 100 / file_size)
status += chr(13)
print(status, end="")
print()
return filename
if __name__ == "__main__": # Only run if this file is called directly
print("Testing with 10MB download")
url = "http://download.thinkbroadband.com/10MB.zip"
filename = download_file(url)
print(filename)
使用5行Python请求
import requests as req
remote_url = 'http://www.example.com/sound.mp3'
local_file_name = 'sound.mp3'
data = req.get(remote_url)
# Save file data to local copy
with open(local_file_name, 'wb')as file:
file.write(data.content)
现在对远程文件的本地副本执行一些操作
我写了下面的代码,它可以在普通的Python 2或Python 3中工作。
import sys
try:
import urllib.request
python3 = True
except ImportError:
import urllib2
python3 = False
def progress_callback_simple(downloaded,total):
sys.stdout.write(
"\r" +
(len(str(total))-len(str(downloaded)))*" " + str(downloaded) + "/%d"%total +
" [%3.2f%%]"%(100.0*float(downloaded)/float(total))
)
sys.stdout.flush()
def download(srcurl, dstfilepath, progress_callback=None, block_size=8192):
def _download_helper(response, out_file, file_size):
if progress_callback!=None: progress_callback(0,file_size)
if block_size == None:
buffer = response.read()
out_file.write(buffer)
if progress_callback!=None: progress_callback(file_size,file_size)
else:
file_size_dl = 0
while True:
buffer = response.read(block_size)
if not buffer: break
file_size_dl += len(buffer)
out_file.write(buffer)
if progress_callback!=None: progress_callback(file_size_dl,file_size)
with open(dstfilepath,"wb") as out_file:
if python3:
with urllib.request.urlopen(srcurl) as response:
file_size = int(response.getheader("Content-Length"))
_download_helper(response,out_file,file_size)
else:
response = urllib2.urlopen(srcurl)
meta = response.info()
file_size = int(meta.getheaders("Content-Length")[0])
_download_helper(response,out_file,file_size)
import traceback
try:
download(
"https://geometrian.com/data/programming/projects/glLib/glLib%20Reloaded%200.5.9/0.5.9.zip",
"output.zip",
progress_callback_simple
)
except:
traceback.print_exc()
input()
注:
支持“进度条”回调。 从我的网站上下载一个4 MB的测试包。zip。