How do I remove a range (subsection) of a list in Python?

Question

I have a simple, always-consecutive-ordered list like this:

all = [ 1, 2, 3, 4, 5, 6 ] # same as range( 1, 7 ) 

I also have current = 4. In the end I want the all list to look like this

altered = [ 1, 2, 5, 6 ] 

So what happened was it removed the current number and the one before it 3.

current can also be 1 and 0, so I want to make sure it doesn't throw an error for those two values.

For the exception current = 0, the altered list is like this

altered = [ 1, 2, 3, 4, 5 ] 

Which means that current = 0 simply removes the last number.

I feel like you can probably code something fancy with generators, but I suck at writing them.

Thanks in advance!

Bonus points for doing this in one line. If the current = 0 is too much trouble, then it could also be current = -1 or current = 7.

EDIT: Make sure to check for current = 1, which should be

altered = [ 2, 3, 4, 5, 6 ] 

Answer 1

all = all[:max(current - 2, 0)] + all[current:] 

or

del all[max(current - 2, 0):current]