python - Cannot install any packages with pip -


when try , install packages pip following error:

could not find version satisfies requirement sendgrid==4.2.0 (from versions: )

for sake of example:

pip search sendgrid > ... > sendgrid (4.2.0)                   - sendgrid library python > ...  pip install sendgrid > collecting sendgrid > not find version satisfies requirement sendgrid (from versions: ) > no matching distribution found sendgrid

similarly:

pip search vcr >amivcrm (0.1)              - simple connector amiv sugarcrm >betamax-matchers (0.4.0)   - vcr imitation python-requests >betamax (0.8.0)            - vcr imitation 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 working on projects use  >crontabs. >httpsrvvcr (0.1.9)         - vcr recording proxy-server usage  >vcr (0.0.9)                - vcr - decorator capturing , simulating network communication >vcrpy (1.11.1)             - automatically mock http interactions simplify , speed                          testing  pip install vcr==0.0.9 >collecting vcr==0.0.9 >could not find version satisfies requirement vcr==0.0.9 (from versions: ) >no matching distribution found vcr==0.0.9

running python 3.6 in virtualenv mac osx sierra 10.12.5 (16f2073)

which pip >pip: aliased noglob pip

running command:

pip install sendgrid --isolated

works


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