使用homebrew安装python3.7后，报警如下：

  WARNING: The scripts pip, pip3 and pip3.7 are installed in '/Users/dailei/Library/Python/3.7/bin' which is not on PATH.
  Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.

解决方案：

vi .bash_profile
export PATH=$PATH:/Users/dailei/Library/Python/3.7/bin