我需要使用request.get进行网络链接：
https://www.investing.com/crypto/bitcoin/btc-usd-historical-data
默认值为bitfinex，但是我需要Kraken的页面，可以从下拉菜单中进行选择。我在下面包含了html代码。我看不到要选择的选项值，然后将其作为数据参数传递，那么如何使用request.get来设置此下拉列表的值？
<div class="clear"></div><div class="exchangeDropdownContainer float_lang_base_1 instDropDown" id="DropDownContainer">
<a id="DropdownBtn" class="newBtnDropdown inlineblock ">
<span class="ceFlags bitcoin"> </span>
<i class="btnTextDropDwn arial_12 bold">Bitfinex</i>
<i class="bottunImageDoubleArrow buttonWhiteImageDownArrow"> </i>
</a>
<table class="genTbl closedTbl exchangeDropdownTbl displayNone" id="DropdownSiblingsTable">
<thead>
<tr>
<th class="center"> </th>
<th class="left">Symbol</th>
<th class="left">Exchange</th>
<th class="center">Currency</th>
<th class="left"> </th>
</tr>
</thead>
<tbody>
<tr data-href="/crypto/bitcoin/btc-usd-historical-data" class="selected">
<td class="center"><i class="ceFlags bitcoin"> </i></td>
<td class="left bold"><a href="/crypto/bitcoin/btc-usd-historical-data">BTC/USD</a></td>
<td class="left">Bitfinex</td>
<td class="center">USD</td>
<td class="left lightgrayFont bold">Real-time</td>
</tr>
<tr data-href="/indices/investing.com-btc-usd-historical-data" >
<td class="center"><i class="ceFlags bitcoin"> </i></td>
<td class="left bold"><a href="/indices/investing.com-btc-usd-historical-data">BTC/USD</a></td>
<td class="left">Investing.com</td>
<td class="center">USD</td>
<td class="left lightgrayFont bold">Real-time</td>
</tr>
<tr data-href="/crypto/bitcoin/btc-usd-historical-data?cid=53082" >
<td class="center"><i class="ceFlags bitcoin"> </i></td>
<td class="left bold"><a href="/crypto/bitcoin/btc-usd-historical-data?cid=53082">BTC/USD</a></td>
<td class="left">OKCoin</td>
<td class="center">USD</td>
<td class="left lightgrayFont bold">Real-time</td>
</tr>
<tr data-href="/crypto/bitcoin/btc-usd-historical-data?cid=1010780" >
<td class="center"><i class="ceFlags bitcoin"> </i></td>
<td class="left bold"><a href="/crypto/bitcoin/btc-usd-historical-data?cid=1010780">BTC/USD</a></td>
<td class="left">Poloniex</td>
<td class="center">USD</td>
<td class="left lightgrayFont bold">Real-time</td>
</tr>
<tr data-href="/crypto/bitcoin/btc-usd-historical-data?cid=1010796" >
<td class="center"><i class="ceFlags bitcoin"> </i></td>
<td class="left bold"><a href="/crypto/bitcoin/btc-usd-historical-data?cid=1010796">BTC/USD</a></td>
<td class="left">GDAX</td>
<td class="center">USD</td>
<td class="left lightgrayFont bold">Real-time</td>
</tr>
<tr data-href="/crypto/bitcoin/btc-usd-historical-data?cid=53073" >
<td class="center"><i class="ceFlags bitcoin"> </i></td>
<td class="left bold"><a href="/crypto/bitcoin/btc-usd-historical-data?cid=53073">BTC/USD</a></td>
<td class="left">ANX</td>
<td class="center">USD</td>
<td class="left lightgrayFont bold">Real-time</td>
</tr>
<tr data-href="/crypto/bitcoin/btc-usd-historical-data?cid=49799" >
<td class="center"><i class="ceFlags bitcoin"> </i></td>
<td class="left bold"><a href="/crypto/bitcoin/btc-usd-historical-data?cid=49799">BTC/USD</a></td>
<td class="left">Kraken</td>
<td class="center">USD</td>
<td class="left lightgrayFont bold">Real-time</td>
</tr>
我需要将下拉列表设置为Kraken选项
答案 0 :(得分：0)
将请求传递到以下网址
https://www.investing.com/crypto/bitcoin/btc-usd-historical-data?cid=49799
只需更改基本URL页面中的下拉列表，您就会看到cid参数已添加到其中。进行网页抓取时，重要的是要与要抓取的网站一起玩耍。
import requests
headers = {'User-Agent' : 'Mozilla/5.0 (Macintosh; Intel Mac OS X x.y; rv:42.0) Gecko/20100101 Firefox/42.' }
url="https://www.investing.com/crypto/bitcoin/btc-usd-historical-data?cid=49799"
response=requests.get(url,headers=headers)
print(response.text)