When I try to install plotly with pip in a Mac with python 2.7, i get the following message:
Collecting plotly
Could not fetch URL https://pypi.python.org/simple/plotly/: There was a problem confirming the ssl certificate: [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:661) - skipping
Could not find a version that satisfies the requirement plotly (from versions: )
No matching distribution found for plotly