python - 如何在 Python 中从 Web Scraping 构造数据框

Question

我可以通过 Python 中的网络抓取从网页中获取数据。我的数据被提取到一个列表中。但不知道如何将该列表转换为数据框。有什么办法可以直接从网络抓取数据并将数据提取到 df 吗？这是我的代码：

import pandas as pd
import requests
from bs4 import BeautifulSoup
from tabulate import tabulate
from pandas import DataFrame
import lxml

# GET the response from the web page using requests library
res = requests.get("https://www.worldometers.info/coronavirus/")

# PARSE and fetch content using BeutifulSoup method of bs4 library
soup = BeautifulSoup(res.content,'lxml')
table = soup.find_all('table')[0]
df = pd.read_html(str(table))

# Here dumping the fetched data to have a look
print( tabulate(df[0], headers='keys', tablefmt='psql') )
print(df[0])

Answer 1

Wellread_html返回一个DataFrames 列表（根据文档），因此您必须获取该列表的“第一个”（也是唯一一个）元素。

我会在最后添加（在您致电之后read_html）：

df = df[0]

然后你可以检查它的信息获取：

df.info()

# <class 'pandas.core.frame.DataFrame'>
# RangeIndex: 207 entries, 0 to 206
# Data columns (total 10 columns):
# Country,Other       207 non-null object
# TotalCases          207 non-null int64
# NewCases            59 non-null object
# TotalDeaths         144 non-null float64
# NewDeaths           31 non-null float64
# TotalRecovered      154 non-null float64
# ActiveCases         207 non-null int64
# Serious,Critical    112 non-null float64
# Tot Cases/1M pop    205 non-null float64
# Deaths/1M pop       142 non-null float64
# dtypes: float64(6), int64(2), object(2)
# memory usage: 16.3+ KB

Answer 2

import requests
import pandas as pd

r = requests.get("https://www.worldometers.info/coronavirus/")
df = pd.read_html(r.content)[0]

print(type(df))

# <class 'pandas.core.frame.DataFrame'>

df.to_csv("data.csv", index=False)

输出：查看