如果你知道是分机，那么

url = 'abcdc.com'
...
url.rsplit('.', 1)[0]  # split at '.', starting from the right, maximum 1 split

这同样适用于abcdc.com或www.abcdc.com或abcdc。[任何东西]并且更具有可扩展性。

def strip_end(text, suffix):
    if suffix and text.endswith(suffix):
        return text[:-len(suffix)]
    return text

我使用了内置的rstrip函数，如下所示:

string = "test.com"
suffix = ".com"
newstring = string.rstrip(suffix)
print(newstring)
test

一个更广泛的解决方案，增加替换后缀的可能性(你可以用空字符串替换)，并设置替换的最大数量:

def replacesuffix(s,old,new='',limit=1):
    """
    String suffix replace; if the string ends with the suffix given by parameter `old`, such suffix is replaced with the string given by parameter `new`. The number of replacements is limited by parameter `limit`, unless `limit` is negative (meaning no limit).

    :param s: the input string
    :param old: the suffix to be replaced
    :param new: the replacement string. Default value the empty string (suffix is removed without replacement).
    :param limit: the maximum number of replacements allowed. Default value 1.
    :returns: the input string with a certain number (depending on parameter `limit`) of the rightmost occurrences of string given by parameter `old` replaced by string given by parameter `new`
    """
    if s[len(s)-len(old):] == old and limit != 0:
        return replacesuffix(s[:len(s)-len(old)],old,new,limit-1) + new
    else:
        return s

在您的情况下，给定默认参数，将获得所需的结果:

replacesuffix('abcdc.com','.com')
>>> 'abcdc'

一些更普遍的例子:

replacesuffix('whatever-qweqweqwe','qwe','N',2)
>>> 'whatever-qweNN'

replacesuffix('whatever-qweqweqwe','qwe','N',-1)
>>> 'whatever-NNN'

replacesuffix('12.53000','0',' ',-1)
>>> '12.53   '

对于url(通过给定的例子，它似乎是主题的一部分)，可以这样做:

import os
url = 'http://www.stackoverflow.com'
name,ext = os.path.splitext(url)
print (name, ext)

#Or:
ext = '.'+url.split('.')[-1]
name = url[:-len(ext)]
print (name, ext)

两者都会输出: (“http://www.stackoverflow”,“。com”)

这也可以与str.endswith(后缀)相结合，如果你只需要分割“。com”，或任何特定的东西。

这里，我有一个最简单的代码。

url=url.split(".")[0]