无法使用pip安装任何软件包

Question

当我尝试使用pip安装任何软件包时，我收到以下错误：

n = 200000 #chunk row size list_df = [df[i:i+n] for i in range(0,df.shape[0],n)]

为了举个例子：

Could not find a version that satisfies the requirement sendgrid==4.2.0 (from versions: )

类似地：

pip search sendgrid
> ...
> sendgrid (4.2.0)                   - SendGrid library for Python
> ...

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

在virtualenv中运行python 3.6 mac osx Sierra 10.12.5（16F2073）

pip search vcr
>amivcrm (0.1)              - A simple connector to the AMIV SugarCRM
>betamax-matchers (0.4.0)   - A VCR imitation for python-requests
>betamax (0.8.0)            - A VCR imitation for python-requests
>cubicweb-vcrs (0.2.1)      - vcreview statistics
>cubicweb-vcreview (2.4.0)  - patch review system on top of vcsfile
>devcron (0.4)              - Cron for working on projects that use 
>crontabs.
>httpsrvvcr (0.1.9)         - VCR recording proxy-server for usage with 
>vcr (0.0.9)                - VCR - decorator for capturing and simulating network communication
>vcrpy (1.11.1)             - Automatically mock your HTTP interactions to simplify and speed up
                         testing

pip install vcr==0.0.9
>Collecting vcr==0.0.9
>Could not find a version that satisfies the requirement vcr==0.0.9 (from versions: )
>No matching distribution found for vcr==0.0.9

Answer 1

运行命令：

pip install sendgrid --isolated

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