如何使用Python对图表进行web抓取？

import requests
from bs4 import BeautifulSoup
import pandas as pd
import matplotlib.pyplot as plt

# 发送HTTP请求，获取网页内容
url = "https://example.com/chart"
response = requests.get(url)

# 解析HTML页面
soup = BeautifulSoup(response.content, "html.parser")

# 定位图表元素
chart_element = soup.find("div", class_="chart")

# 提取图表数据
data = []
for item in chart_element.find_all("li"):
    label = item.find("span", class_="label").get_text()
    value = item.find("span", class_="value").get_text()
    data.append((label, value))

# 数据处理和可视化
df = pd.DataFrame(data, columns=["Label", "Value"])
plt.bar(df["Label"], df["Value"])
plt.xlabel("Label")
plt.ylabel("Value")
plt.title("Chart")
plt.show()