How do I use tuples to increment specific items in nested lists?-CodePudding

So my prompt is there is a few nested lists (ex.[[0,0,0], [0,0,0]]) and I need to use a tuple ex. [(0,0),(1,2)] to increment the spots in the original lists by 1. It should look like this "[[1,0,0][0,0,1]]" I get i need to probably nest for loops by I'm strugling to figure out the exact details if someone can help that would be great.

What I have so far:

def increment_attendance(seating, locations):
    for i in range(len(locs)):
        for j in range(len(locs(i)))
            seating[i][j][0]  = 1
            seating[i][j][1]  = 1
        
        
        
return seating

CodePudding user response：

Let's think about this problem in words:

for each location
   increment the seating at that location by 1

When we do this, we now see that there is only one for loop. So our code should only be a single for loop. There's no need for a nested loop.

The next steps is to clarify what "increment the seating at that location by 1" means. Well, a "location" is an x and y coordinate as a tuple. So now we can change our wording:

for each location
   increment the seating by at the (x, y) coordinate of the location

I'll let you translate this into code from here.

CodePudding user response：

You need neither nested for loops nor len function in the loop. You can do something like:

def increment_attendance(seating, locations):
  for innerTuple in locations:
    seating[innerTuple[0]][innerTuple[1]]  = 1
  return(seating)
increment_attendance([[0,0,0], [0,0,0]], [(0,0),(1,2)])

The output of example above would be:

[[1, 0, 0], [0, 0, 1]]

CodePudding user response：

You can unpack tuples in a for loop like so:

def increment_attendance(seating, locations):
    for row, column in locations:
        seating[row][column]  = 1
    return seating