Most used PDB Commands are:
Command   Key  Description
Next         n       Execute the next line
Print        p        Print the value of the variable following p
Repeat     Enter     Repeat the last entered command
List         l         Show few lines above and below the current line
Step        s         Step into a subroutine
Return      r        Run until the current subroutine returns
Continue   c          Stop debugging the current breakpoint and continue normally
Quit       q          Quit pdb abruptly