python3.7以上版本安装pip

curl "https://bootstrap.pypa.io/get-pip.py" -o "get-pip.py"
python get-pip.py

python2.7.5版本安装pip

curl "https://bootstrap.pypa.io/pip/2.7/get-pip.py" -o "get-pip.py"
python get-pip.py

安装结果：

Collecting pip<21.0
  Downloading pip-20.3.4-py2.py3-none-any.whl (1.5 MB)
     |████████████████████████████████| 1.5 MB 20 kB/s
Collecting wheel
  Downloading wheel-0.37.1-py2.py3-none-any.whl (35 kB)
Installing collected packages: pip, wheel
Successfully installed pip-20.3.4 wheel-0.37.1

使用pip安装第三方库

pip install flask

安装结果：

Collecting flask
  Downloading Flask-1.1.4-py2.py3-none-any.whl (94 kB)
     |████████████████████████████████| 94 kB 44 kB/s
Collecting click<8.0,>=5.1
  Downloading click-7.1.2-py2.py3-none-any.whl (82 kB)
     |████████████████████████████████| 82 kB 11 kB/s
Collecting itsdangerous<2.0,>=0.24
  Downloading itsdangerous-1.1.0-py2.py3-none-any.whl (16 kB)
Collecting Jinja2<3.0,>=2.10.1
  Downloading Jinja2-2.11.3-py2.py3-none-any.whl (125 kB)
     |████████████████████████████████| 125 kB 11 kB/s
Collecting Werkzeug<2.0,>=0.15
  Downloading Werkzeug-1.0.1-py2.py3-none-any.whl (298 kB)
     |████████████████████████████████| 298 kB 5.3 kB/s
Collecting MarkupSafe>=0.23
  Downloading MarkupSafe-1.1.1-cp27-cp27mu-manylinux1_x86_64.whl (24 kB)
Installing collected packages: click, itsdangerous, MarkupSafe, Jinja2, Werkzeug, flask
Successfully installed Jinja2-2.11.3 MarkupSafe-1.1.1 Werkzeug-1.0.1 click-7.1.2 flask-1.1.4 itsdangerous-1.1.0