使用Python3.6安装NLTK时出错

我试图运行“pip install nltk”，但出现了很多错误。虽然我试图安装导致错误的依赖项，但它们没有得到安装

Invalid requirement: 'nltk()'
Traceback (most recent call last):
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\_vendor\packagi
ng\requirements.py", line 92, in __init__
    req = REQUIREMENT.parseString(requirement_string)
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\_vendor\pyparsi
ng.py", line 1617, in parseString
    raise exc
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\_vendor\pyparsi
ng.py", line 1607, in parseString
    loc, tokens = self._parse( instring, 0 )
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\_vendor\pyparsi
ng.py", line 1379, in _parseNoCache
    loc,tokens = self.parseImpl( instring, preloc, doActions )
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\_vendor\pyparsi
ng.py", line 3376, in parseImpl
    loc, exprtokens = e._parse( instring, loc, doActions )
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\_vendor\pyparsi
ng.py", line 1383, in _parseNoCache
    loc,tokens = self.parseImpl( instring, preloc, doActions )
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\_vendor\pyparsi
ng.py", line 3164, in parseImpl
    raise ParseException(instring, loc, self.errmsg, self)
pip._vendor.pyparsing.ParseException: Expected stringEnd (at char 4), (line:1, c
ol:5)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\req\req_install
.py", line 82, in __init__
    req = Requirement(req)
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\_vendor\packagi
ng\requirements.py", line 96, in __init__
    requirement_string[e.loc:e.loc + 8]))
pip._vendor.packaging.requirements.InvalidRequirement: Invalid requirement, pars
e error at "'()'"

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请检查屏幕截图是否有错误：

您似乎没有安装软件包的权限。尝试以管理员身份运行命令行。

Python软件包管理最佳实践是创建虚拟环境，请参阅

首先为本地用户安装

virtualenv

库

pip install --user virtualenv

看到和

对于Python2.7，在目录

my\u nltk\u项目下创建一个虚拟环境

virtualenv -p /usr/bin/python2.7 my_nltk_project

或者在Python3中：

virtualenv -p /usr/bin/python3.5 my_nltk_project
source my_nltk_project/bin/activate

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确保Python3是Py3.4或Py3.5，Py3.6尚未得到官方支持，请参阅

现在，您应该在虚拟环境中，命令提示符如下所示：

(my_nltk_project):~$ 

现在执行pip安装：

pip install nltk

或者，使用

-U

选项升级

nltk

（

pip安装-U nltk

）

使用完环境后，只需执行以下操作即可离开环境：

(my_nltk_project):~$ deactivate

:~$ source my_nltk_project/bin/activate

pip install --user nltk

要重用环境，请执行以下操作：

(my_nltk_project):~$ deactivate

:~$ source my_nltk_project/bin/activate

pip install --user nltk

---

或者，您可以在不使用虚拟环境的情况下尝试此操作：

(my_nltk_project):~$ deactivate

:~$ source my_nltk_project/bin/activate

pip install --user nltk

---

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如果您在Windows计算机上，强烈建议您使用

conda

来管理NLTK软件包，请参阅

Py3.6尚未正式支持，请参阅的可能副本