In the above examples we were printing cell attributes such as cell type, cell id etc. Sometimes in the simulations you will have two cells and you may want to test if they are different. The most straightforward Python construct would look as follows:

cell1 = self.cellField.get(pt)
cell2 = self.cellField.get(pt)
if cell1 != cell2:
    # do something

Because cell1 and cell2 point to cell at pt i.e. the same cell then cell1 != cell2 should return false. Alas, written as above the condition is evaluated to true. The reason for this is that what is returned by cellField is a Python object that wraps a C++ pointer to a cell. Nevertheless two Python objects cell1 and cell2 are different objects because they are created by different calls to self.cellField.get() function. Thus, although logically they point to the same cell, you cannot use != operator to check if they are different or not.

The solution is to use the following function


or write your own Python function that would do the same:

def are_cells_different(self, cell1, cell2):
    if (cell1 and cell2 and cell1.this != cell2.this) or\
       (not cell1 and cell2) or (cell1 and not cell2):
        return 1
        return 0