Ubantu Python2 and Python3 related compatibility update issues

Ubuntu14.04, Python3.3 and 2.7 are installed in the system.
Use sudo apt-get install Python-pip
sudo apt-get install Python3-pip
Each of the two versions corresponds to a PIP

= = Update, for Linux = =
When the PIP, PIP2, or PIP3 install fails, you can try the following:

# 以安装 youtube-dl 举例# proxy_host:proxy_port 为代理地址export https_proxy=proxy_host:proxy_portsudo -H pip install --upgrade youtube-dl# 或 sudo -H pip2 install --upgrade youtube-dl# 或 sudo -H pip3 install --upgrade youtube-dl# 或 sudo -H python3.5 -m pip install youtube-dl

PIP configuration is not good to affect the use of Python (mood), I hope everyone less detours.

Ubantu Python2 and Python3 related compatibility update issues