tr class=tr-heji style=display table-row; tdGSPure Circ-eGFPtd tdR0701td td1gtd td class=shuliang1td td class=jiage100td td class=proZhe

可以使用以下代码判断td下是否有input标签，并获取其值：

from bs4 import BeautifulSoup

html = '''
<tr class="tr-heji" style="display: table-row;">
    <td>GSPure Circ-eGFP</td>
    <td>R0701</td>
    <td>1g</td>
    <td class="shuliang">1</td>
    <td class="jiage">100</td>
    <td class="proZhekou">￥<input type="text" value="0" style="width: 50px;"></td>
    <td class="heji">￥99.00</td>
</tr>
'''

soup = BeautifulSoup(html, 'html.parser')
td = soup.find('td', class_='proZhekou')
input_tag = td.find('input')

if input_tag:
    value = input_tag['value']
    print(value)
else:
    print('No input tag found')

输出结果为：

0
``