为什么这个findAll请求不返回任何数据

Question

所以，我试图从www.theweathernetwork.com中提取温度值，当我检查元素时，我得到以下结构：

<div class="mainTemp-wrap">
    <p class="temperature">
    14
    <span>
    °C
    </span>
    </p>
    <p class="mcity-feels-like">Feels like 
    <span>13</span>
    </p>
</div>

但是当我运行以下代码时，我什么都没有回复：

import requests
from bs4 import BeautifulSoup

url = "https://www.theweathernetwork.com/us/weather/illinois/chicago"
r = requests.get(url)
soup = BeautifulSoup(r.content)

g_data = soup.findAll("p", {"class": "temperature"})

print g_data