def shiftLeft(data):
    pos = 1 # When shifting to the left we start at the left!
    # we start at position 1
    while pos < len(data):
        data[pos-1] = data[pos] # perform the shift
        pos = pos + 1
    # make the last item blank
    data[pos-1] = 0
    return data

def shiftRight(data):
    pos = len(data) - 2 # When shifting to the left we start at the right!
    # we start at the second to last item
    while pos >=0:
        data[pos+1] = data[pos] # perform the shift
        pos = pos - 1
    # make the last item blank
    data[0] = 0
    return data

# these are for 2d arrays (columns)
def shiftDown(data, col):
    row = len(data) - 2 # When shifting to the left we start at the right!
    # we start at the second to last item
    while row >=0:
        data[row+1][col] = data[row][col] # perform the shift
        row = row - 1
    # make the last item blank
    data[0][col] = 0
    return data

def display2D_array(data):
    row =0
    while row < len(data):
        rowArray = data[row]
        col =0
        temp = ""
        while col < len(rowArray):
            temp+=str(rowArray[col]) + " " * (3 - len(str(rowArray[col])))
            col +=1
        row +=1
        print(temp)