python pip list 命令列出所有安裝包和版本信息

c:\Python27\Scripts>pip list
DEPRECATION: The default format will switch to columns in the future. You can use --format=(legacy|columns) (or define a format=(legacy|columns) in your pip.conf under the [list] section) to disable this warning.
et-xmlfile (1.0.1)
jdcal (1.4)
openpyxl (2.5.2)
pip (9.0.1)
setuptools (28.8.0)
You are using pip version 9.0.1, however version 10.0.0 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.