<s>[INST] How to comment out a block of Python code in Vim I was wondering if there was any key mapping in Vim to allow me to indent certain lines of code (whether those lines have been selected in visual mode, or n lines above/below current cursor position).
So basically something that converts the following 
def my_fun(x, y):
    return x + y

to
#def my_fun(x, y):
#    return x + y

I am okay with using either # or """ for commenting out the relevant lines. Ideally, I would also like the same keymapping to uncomment the lines if the given lines have been commented out.
 [/INST] Step 1: Go to the the first column of the first line you want to comment.

Step 2: Press: Ctrl+v and select the lines you want to comment:

Step 3: Shift-I#space (Enter Insert-at-left mode, type chars to insert.  The selection will disappear, but all lines within it will be modified after Step 4.)

Step 4: Esc

 </s>