网易云音乐歌曲下载

环境 ：Windows + Python 3.7 + selenium

    <div class="u-cover u-cover-1">

    browser.find_elements_by_css_selector('[class = "u-cover u-cover-1"]')

原因：
selenium 打开网页后， 默认是在父级 Frame 里， 直接搜索是搜不到子 Frame 里的信息的。
需要切换 Frame。

方法：

switch_to.frame('frameid')

switch_to.parent_frame()

原因：点击后，浏览器新打开了个选项卡。没有切换过来，导致还是在旧的选项卡里查找

解决：

browser.switch_to_window(browser.window_handles[1])

    <iframe name="contentFrame" id="g_iframe" class="g-iframe" scrolling="auto" frameborder="0" src="about:blank" allowfullscreen="true"></iframe>

    browser.switch_to.frame('g_iframe')

       selenium.common.exceptions.StaleElementReferenceException: Message: stale element reference: element is not attached to the page document

    we_gedans = self.browser.find_elements_by_css_selector('[class = "u-cover u-cover-1"]')

for we_gedan in we_gedans:
    we_gedan.click()</code></pre></div></div><ul class="ul-level-0"><li>原因</li></ul><div class="rno-markdown-code"><div class="rno-markdown-code-toolbar"><div class="rno-markdown-code-toolbar-info"><div class="rno-markdown-code-toolbar-item is-type"><span class="is-m-hidden">代码语言：</span>javascript</div></div><div class="rno-markdown-code-toolbar-opt"><div class="rno-markdown-code-toolbar-copy"><i class="icon-copy"></i><span class="is-m-hidden">复制</span></div></div></div><div class="developer-code-block"><pre class="prism-token token line-numbers language-javascript"><code class="language-javascript" style="margin-left:0">官方给出解释如下：

The element has been deleted entirely.

The element is no longer attached to the DOM.

就是页面元素过期，引用的元素过时，不再依附于当前页面，需要重新定位获取元素对象
find_elements 查找到的是 WebElement 类型的数组数据，含有元素在当前页面的地址信息，调用 click() 方法就是使用了此地址信息。

切换页面后，此地址信息就失效了。所以不能在直接在循环中调用 click()

 import magic

File "C:\Users\zuoy\AppData\Local\Programs\Python\Python37\lib\site-packages\magic.py", line 181, in <module>

raise ImportError('failed to find libmagic.  Check your installation')

ImportError: failed to find libmagic.  Check your installation

pip install pip install python-magic-bin

pip install eyed3

#!/usr/bin/env python

'''

功能：访问网易云音乐网站，下载歌单里的所有免费歌曲

时间：2019/07/20

'''
from selenium import webdriver

from selenium.webdriver.common.by import By

from selenium.webdriver.common.keys import Keys

from selenium.webdriver.support import expected_conditions as EC

from selenium.webdriver.support.wait import WebDriverWait
import requests

import eyed3  # 给下载的MP3歌曲添加属性信息：专辑名、歌手等
import time

import json

import os
class Splider(object):

def init(self):

self.__url = 'https://music.163.com/'

self.browser = webdriver.Chrome()
def __get_gedans(self, url=None):
    gedans = []
    self.browser.get(self.__url)
    self.browser.switch_to.frame('g_iframe')
    we_gedans = self.browser.find_elements_by_css_selector('[class = "u-cover u-cover-1"]')
    for we_gedan in we_gedans:
        gedan = {}
        gedan = {
            'title': we_gedan.find_element_by_css_selector('a').get_attribute('title'),
            'url': we_gedan.find_element_by_css_selector('a').get_attribute('href'),
            'image': we_gedan.find_element_by_css_selector('img').get_attribute('src'),
            'click': we_gedan.find_element_by_css_selector('.nb').text
        }
        gedans.append(gedan)
    return gedans       

def __get_songs(self, gedan):
    urls = []
    self.browser.get(gedan['url'])
    self.browser.switch_to.frame('g_iframe')
    we_songs = self.browser.find_elements_by_css_selector('[class = "even "]')
    for we_song in we_songs:
        url = {
            'id': we_song.find_element_by_css_selector('.left .hd span').get_attribute('data-res-id'),
            'name': we_song.find_element_by_css_selector('.f-cb b').get_attribute('title'),
            'songer': we_song.find_elements_by_css_selector('.text')[0].get_attribute('title'),
            'cd': we_song.find_elements_by_css_selector('.text')[1].find_element_by_css_selector('a').get_attribute('title')
        }
        # 清理掉其中的非显示字符
        for key, value in url.items():
            url[key] = ' '.join(value.split())
        urls.append(url)
    return urls

def __download_song(self, song):
    base_url = "http://music.163.com/song/media/outer/url?id={0}"
    url = base_url.format(song['id'])
    re = requests.get(url)
    if re.status_code == 200:
        filename = song['name'] + '.mp3'
        with open(filename, 'wb') as f:
            f.write(re.content)
        at_song = eyed3.load(filename)
        at_song.tag.artist = song['songer']
        at_song.tag.album = song['cd']
        at_song.tag.title = song['name']
        at_song.tag.save()
        
    return

def __save_json(self, strs, filename):
    filename = filename if os.path.splitext(filename)[1] == '.json' else os.path.splitext(filename)[0] + '.json'
    with open(filename, 'w', encoding='utf-8') as f:
        f.write(json.dumps(strs, indent=4, ensure_ascii=False))

def __read_json(self, filename):
    data = []
    filename = filename if os.path.splitext(filename)[1] == '.json' else os.path.splitext(filename)[0] + '.json'
    with open(filename, 'r', encoding='utf-8') as f:
        data = json.loads(f.read())
    return data

def run(self):
    gedans = self.__get_gedans()
    self.__save_json(gedans, 'gedans.json')
    for gedan in gedans:
        try:
            songs = self.__get_songs(gedan)
            self.__save_json(songs, 'songs.json')
        except Exception as e:
            print(e.args)
        os.chdir('songs')
        for song in songs:
            try:
                self.__download_song(song)
            except Exception as e:
                print(e.args)
        os.chdir('..')
    self.browser.close()

if name == 'main':

splider = Splider()

splider.run()