Error while installing NLTK with Python3.6

Question

I tried to run "pip install nltk" but getting so many error. Though I tried to install dependencies which are causing error, but they are not getting installed as well.

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 "'()'"

Please check screenshot for error: Error Screenshot

Py3.6 is not yet officially support, see github.com/nltk/nltk/issues/1659 — alvas
– alvas, Commented May 8, 2017 at 9:03
Possible duplicate of stackoverflow.com/questions/42313776/… — alvas
– alvas, Commented May 8, 2017 at 9:06

matusko · Accepted Answer · 2017-05-06 20:44:04Z

1

It seems you dont have permission to install packages. Try running the command line as administrator.

answered May 6, 2017 at 20:44

matusko

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Comments

Community · Accepted Answer · 2017-05-23 12:02:43Z

Python package managment best practice is to create a virtual environment, see http://python-guide-pt-br.readthedocs.io/en/latest/dev/virtualenvs/

First install the virtualenv library for the local user

pip install --user virtualenv

See How to install python modules without root access? and PEP370

For Python2.7, create a virtual environment under the directory my_nltk_project

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

Or in Python3:

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

Make sure Python3 is Py3.4 or Py3.5, Py3.6 is not yet officially support, see https://github.com/nltk/nltk/issues/1659

Now you should be within the virtual environment and your command prompt will look like this:

(my_nltk_project):~$

Now do a pip install:

pip install nltk

Optionally, use the -U option is to upgrade nltk (pip install -U nltk)

After you're done with the environment, simply do this to leave the environment:

(my_nltk_project):~$ deactivate

To reuse the environment:

:~$ source my_nltk_project/bin/activate

Alternatively, you could try this without the virtual environment:

pip install --user nltk

If you're on a Windows machine, it's strongly recommended that you use conda to manage NLTK packages, see https://gist.github.com/alvations/0ed8641d7d2e1941b9f9

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