无法使用conda install或pip install安装某些软件包

Question

I installed Anaconda3 in my computer and created a virtualenv named Python27 with python version 2.7, I want to install several packages in my virtualenv, but conda install or pip install works for some packages and not for others, for example, I was not able to install csv, a package to manage comma separated values documents, this is the output I get using conda install:

$ conda install csv
Fetching package metadata .........

PackageNotFoundError: Packages missing in current channels:

  - csv

We have searched for the packages in the following channels:

  - https://repo.continuum.io/pkgs/free/linux-64
  - https://repo.continuum.io/pkgs/free/noarch
  - https://repo.continuum.io/pkgs/r/linux-64
  - https://repo.continuum.io/pkgs/r/noarch
  - https://repo.continuum.io/pkgs/pro/linux-64
  - https://repo.continuum.io/pkgs/pro/noarch

and using pip install:

$ pip install csv
Collecting csv
Could not find a version that satisfies the requirement csv (from versions: )
No matching distribution found for csv

How do I install the package csv in my virtualenv or any other package I was not able to install this way?

Thanks in advance.

Answer 1

You cannot install csv, because it is already included in your python installation.

Just go

import csv

Answer 2

It's a standard library module: csv . It should be available without installation.

Just to make sure I tested it with a clean environment.

$ conda create -n test python   # new environment without any additional packages
$ activate test                 # go to that environment
$ python                        # start the python interpreter
>>> import csv                  # importing it works!