How to use the command !G 1 500to work with python

Hello, I have been going through the data streets for motor controllers and they say you can use commands like !G, !M when I use them in my python script they don't work what am I doing wrong. What does this mean Speed can be also set as an absolute RPM value using the S command from Serial, USB,
CAN or Microbasic I copied it from the datasheet. Can so one please help me