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我刚刚在Windows 10机器上安装了Python 2.7.5,并且我还通过setuptools安装了pip。但是,每当我尝试使用pip来安装某些内容时, pip install numpy
,我得到这个错误信息:“sre_constants.error:什么都没有重复”每次尝试使用pip安装错误
Traceback (most recent call last):
File "C:\Python27\Scripts\pip-script.py", line 8, in <module>
load_entry_point('pip==9.0.1', 'console_scripts', 'pip')()
File "C:\Python27\lib\site-packages\pkg_resources.py", line 318, in load_entry_point
return get_distribution(dist).load_entry_point(group, name)
File "C:\Python27\lib\site-packages\pkg_resources.py", line 2221, in load_entry_point
return ep.load()
File "C:\Python27\lib\site-packages\pkg_resources.py", line 1954, in load
entry = __import__(self.module_name, globals(),globals(), ['__name__'])
File "C:\Python27\lib\site-packages\pip-9.0.1-py2.7.egg\pip\__init__.py", line 26, in <module>
from pip.utils import get_installed_distributions, get_prog
File "C:\Python27\lib\site-packages\pip-9.0.1-py2.7.egg\pip\utils\__init__.py", line 27, in <module>
from pip._vendor import pkg_resources
File "C:\Python27\lib\site-packages\pip-9.0.1-py2.7.egg\pip\_vendor\pkg_resources\__init__.py", line 73, in <module>
__import__('pip._vendor.packaging.specifiers')
File "C:\Python27\lib\site-packages\pip-9.0.1-py2.7.egg\pip\_vendor\packaging\specifiers.py", line 275, in <module>
class Specifier(_IndividualSpecifier):
File "C:\Python27\lib\site-packages\pip-9.0.1-py2.7.egg\pip\_vendor\packaging\specifiers.py", line 373, in Specifier
r"^\s*" + _regex_str + r"\s*$", re.VERBOSE | re.IGNORECASE)
File "C:\Python27\Lib\re.py", line 190, in compile
return _compile(pattern, flags)
File "C:\Python27\Lib\re.py", line 242, in _compile
raise error, v # invalid expression
sre_constants.error: nothing to repeat
因为我很新的Python的,我真的不明白这是什么错误表示。任何解决方法?
问题来自用作正则表达式模式的'_regex_str'。如果它包含类似'|?'或'(?'的东西,那么问题就出现了。如果需要文字字符串匹配,它必须是're.escape(_regex_str)'。 –