Way to stop function from checking number

I have a function that basically checks grid spaces from like i-1 to i+1 along with j since its coordinates in the (i,j). However, when I go to check a grid space that hits the right or top side of the grid, it says it can't because it's out of range. My goal is to put something in the code for it to say like if i == some_variable then don't check it.

b_overlap = False
for i in range(grid_i-1, grid_i+1):
    for j in range(grid_j-1, grid_j+1):
        print("i, j = " + str(i) + ", " + str(j))
        if len(v_circle[i][j]) > 0:
            for c_iteration in v_circle[i][j]:
                if distance(c_candidate, c_iteration) < c_iteration.radius_ + c_candidate.radius_:
                    b_overlap = True
if not b_overlap:
    v_circle[grid_i][grid_j].append(c_candidate)
    print("Ball was added at (" + str(x) + ", " + str(y) + ")")

You can check for boundaries using an if and skip those iterations:

b_overlap = False
for i in range(grid_i-1, grid_i+1):
    for j in range(grid_j-1, grid_j+1):
        # Check for boundaries
        if i < 0 or i >= len(v_circle) or j < 0 or j >= len(v_circle[i]):
            continue

        print("i, j = " + str(i) + ", " + str(j))
        if len(v_circle[i][j]) > 0:
            for c_iteration in v_circle[i][j]:
                if distance(c_candidate, c_iteration) < c_iteration.radius_ + c_candidate.radius_:
                    b_overlap = True
if not b_overlap:
    v_circle[grid_i][grid_j].append(c_candidate)
    print("Ball was added at (" + str(x) + ", " + str(y) + ")")

In Python, range(start, end) includes start but excludes end. You can use max() and min() functions to make sure that you're not going out of range.

Assuming grid_size_i and grid_size_j are the maximum ranges for i and j dimensions, you can use max(0, grid_i-1) and max(0, grid_j-1) to make sure you don't go below zero (the left and bottom edges of your grid), and min(grid_i+1, grid_size_i) and min(grid_j+1, grid_size_j) makes sure you don't go beyond your grid's size (the right and top edges).

b_overlap = False
for i in range(max(0, grid_i-1), min(grid_i+1, grid_size_i)):
    for j in range(max(0, grid_j-1), min(grid_j+1, grid_size_j)):
        print("i, j = " + str(i) + ", " + str(j))
        if len(v_circle[i][j]) > 0:
            for c_iteration in v_circle[i][j]:
                if distance(c_candidate, c_iteration) < c_iteration.radius_ + c_candidate.radius_:
                    b_overlap = True
if not b_overlap:
    v_circle[grid_i][grid_j].append(c_candidate)
    print("Ball was added at (" + str(x) + ", " + str(y) + ")")

Alternatively, if your grid size can change during the course of the loop, you could use an approach like Blaz suggested where you check whether each index is valid as you go.