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python - 查找标签内容后出现问题，无法求和

问题描述

我正在尝试从 html 页面中提取标签内容并对内容（字符串）求和，这是我的代码

import urllib.request, urllib.parse, urllib.error
from bs4 import BeautifulSoup

url = input('Enter- ')
html = urllib.request.urlopen(url).read()
soup = BeautifulSoup(html, 'html.parser')

# Retrieve all of the span tags
tags = soup('span')
for tag in tags:
   # Look at the parts of a tag
   print('Sum of Contents:',sum(int(tag.contents[0])))

没有sum(int())它正确返回值的字符串，但我试图将字符串更改为整数并将其求和。我假设我搞砸了一些非常基本的东西？

Contents: 97
Contents: 97
Contents: 90
Contents: 90
Contents: 88
Contents: 87
Contents: 87
Contents: 80
Contents: 79
Contents: 79
Contents: 78
Contents: 76
Contents: 76
Contents: 72
Contents: 72
Contents: 66
Contents: 66
Contents: 65
Contents: 65
Contents: 64
Contents: 61
Contents: 61
Contents: 59
Contents: 58
Contents: 57
Contents: 57
Contents: 54
Contents: 51
Contents: 49
Contents: 47
Contents: 40
Contents: 38
Contents: 37
Contents: 36
Contents: 36
Contents: 32
Contents: 25
Contents: 24
Contents: 22
Contents: 21
Contents: 19
Contents: 18
Contents: 18
Contents: 14
Contents: 12
Contents: 12
Contents: 9
Contents: 7
Contents: 3
Contents: 2

标签： pythonbeautifulsoup

解决方案

尝试使用列表推导首先收集所有整数，然后将它们相加

summation = sum([int(tag.contents[0]) for tag in tags])
print('Sum of Contents:',summation)

如果您不想使用列表推导，可以使用

summation = []
for tag in tags:
    summation.append(int(tag.contents[0]))
print('Sum of Contents:', sum(summation))

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