如何替换python中的所有字符串？

Question

我正在使用调节器经验创建代理刮板。 使用re解析HTML很糟糕，因此我需要确保最终结果中没有字符串显示。 如何用空格替换所有字符串。 我必须清理已解析数据的当前代码是

print title.replace(',', '').replace("!", '').replace(":", '').replace(";", '').replace(str, '') 

str部分是我尝试的。 还有其他方法吗？

Answer 1

如果要从HTML文档中提取所有可见数字，则可以首先使用BeautifulSoup解析HTML文档，然后从中提取文本。 然后，您可以从这些文本元素中提取所有数字：

from bs4 import BeautifulSoup
from urllib.request import urlopen
import re

# let’s use the StackOverflow homepage as an example
r = urlopen('http://stackoverflow.com')
soup = BeautifulSoup(r)

# As we don’t want to get the content from script related
# elements, remove those.
for script in soup(['script', 'noscript']):
    script.extract()

# And now extract the numbers using regular expressions from
# all text nodes we can find in the (remaining) document.
numbers = [n for t in soup(text=True) for n in re.findall('\d+', t)]

然后， numbers将包含文档中所有可见的数字。 如果只想将搜索限制在某些元素上，则可以更改soup(text=True)部分。

Answer 2

replace1 = range(0,46)+range(58,127)+[47] #Makes a list of all the 
#ASCII characters  values that you don't want it to show,
#http://www.asciitable.com/, this includes all the letters,
#and excludes all numbers and '.'

text = '<html><body><p>127.0.0.1</p></body></html>' #Test data.
tmp = '' 

for i in range(len(text)-1): #this goes through each character in the text
...     if not ord(text[i]) in replace1: #checks if that character's 
#ASCII value is in not the list of 'Blacklisted' ASCII values, 
#then appends it to the tmp variable 
...             tmp += text[i]

print tmp
127.0.0.1