替换空格是可以的，但我建议进一步处理其他不利于url的字符，如问号、撇号、感叹号等。

还要注意，搜索引擎优化专家的普遍共识是，在url中，破折号比下划线更受欢迎。

import re

def urlify(s):

    # Remove all non-word characters (everything except numbers and letters)
    s = re.sub(r"[^\w\s]", '', s)

    # Replace all runs of whitespace with a single dash
    s = re.sub(r"\s+", '-', s)

    return s

# Prints: I-cant-get-no-satisfaction"
print(urlify("I can't get no satisfaction!"))

perl -e 'map { $on=$_; s/ /_/; rename($on, $_) or warn $!; } <*>;'

匹配和替换当前目录下所有文件的空格>下划线

令人惊讶的是，这个库还没有被提及

名为Python -slugify的Python包，它可以很好地进行slugify:

pip install python-slugify

工作原理如下:

from slugify import slugify

txt = "This is a test ---"
r = slugify(txt)
self.assertEquals(r, "this-is-a-test")

txt = "This -- is a ## test ---"
r = slugify(txt)
self.assertEquals(r, "this-is-a-test")

txt = 'C\'est déjà l\'été.'
r = slugify(txt)
self.assertEquals(r, "cest-deja-lete")

txt = 'Nín hǎo. Wǒ shì zhōng guó rén'
r = slugify(txt)
self.assertEquals(r, "nin-hao-wo-shi-zhong-guo-ren")

txt = 'Компьютер'
r = slugify(txt)
self.assertEquals(r, "kompiuter")

txt = 'jaja---lol-méméméoo--a'
r = slugify(txt)
self.assertEquals(r, "jaja-lol-mememeoo-a") 

x = re.sub("\s", "_", txt)

替换空格是可以的，但我建议进一步处理其他不利于url的字符，如问号、撇号、感叹号等。

还要注意，搜索引擎优化专家的普遍共识是，在url中，破折号比下划线更受欢迎。

import re

def urlify(s):

    # Remove all non-word characters (everything except numbers and letters)
    s = re.sub(r"[^\w\s]", '', s)

    # Replace all runs of whitespace with a single dash
    s = re.sub(r"\s+", '-', s)

    return s

# Prints: I-cant-get-no-satisfaction"
print(urlify("I can't get no satisfaction!"))

OP使用python，但在javascript中(这是要小心的，因为语法是相似的。

// only replaces the first instance of ' ' with '_'
"one two three".replace(' ', '_'); 
=> "one_two three"

// replaces all instances of ' ' with '_'
"one two three".replace(/\s/g, '_');
=> "one_two_three"