python-ValueError：以10为底的int()的无效文字：’196.41′

我不明白为什么它适用于不同的情况,但不适用于这种情况.
基本上,有位先生帮助我改善了HERE,改进了我的代码以刮除天气,效果很好.然后,我尝试执行相同的操作以刮除范围标记中的ETH值< span class =“ text-large2” data-currency-value =“” $196.01< / span>.因此,我在代码中遵循了相同的技术,替换了字段,并希望它能起作用.

代码在这里：

import requests
from BeautifulSoup import BeautifulSoup
import time

url = 'https://coinmarketcap.com/currencies/litecoin/'

def ltc():
    while (True):
        response = requests.get(url)
        soup = BeautifulSoup(response.content)
        price_now = int(soup.find("div", {"class": "col-xs-6 col-sm-8 col-md-4 text-left"}).find(
        "span", {"class": "text-large2"}).getText())
        print(u"LTC price is: {}{}".format(price_now))
        # if less than 150
        if 150 > price_now:
            print('Price is Low')
        # if more than 200
        elif 200 < price_now:
            print('Price is high')

if __name__ == "__main__":
    ltc()

输出看起来像这样：

Traceback (most recent call last):
  File "test2.py", line 24, in <module>
    ltc()
  File "test2.py", line 13, in ltc
    "span", {"class": "text-large2"}).getText())
ValueError: invalid literal for int() with base 10: '196.01'

然后,我终于尝试了这种方式；但是从这里我得到了误报,但是没有错误.它可以打印任何内容

import requests
from bs4 import BeautifulSoup
import time

url = 'https://coinmarketcap.com/currencies/litecoin/'

def liteCoin():
    while (True):
        response = requests.get(url)
        html = response.text
        soup = BeautifulSoup(html, 'html.parser')
        value = soup.find('span', {'class': 'text-large2'})
        print(''.join(value.stripped_strings))
        if 150 > value:         # if less than 150
            print('Price is Low!')
        elif 200 < value:       # if more than 200
            print('Price is High')
        else:
            print('N/A')
        time.sleep(5)

if __name__ == "__main__":
    liteCoin()

问题是ETH的值在span标签内是否有$符号？而且,这样程序不知道如何处理字符串？

解决方法:

首先,让我们简化您的示例程序：

>>> int('196.01')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: invalid literal for int() with base 10: '196.01'

不能将字符串“ 196.01”转换为整数.

尝试这个：

>>> int(float('196.01'))
196

从简单回到复杂,我们可以这样做：

#UNTESTED
price_now = int(float(soup.find("div", {"class": "col-xs-6 col-sm-8 col-md-4 text-left"}).find(
    "span", {"class": "text-large2"}).getText()))

标签：data-science,beautifulsoup,web-scraping,valueerror,python
来源： https://codeday.me/bug/20191025/1929101.html