calling class/static method from class variable in python

Question

I\'m trying to make a ImageLoader class handle the loading and processing of image resources like this:

class ImageLoader:
    TileTable = __loadTileTable(\'         


        

Answer 1

In Python, the code in the class block is first executed, then the resultant namespace is passed to the class initializer. The code you wrote could have also been written as:

TileTable = _loadTileTable(arg1, arg2)
@staticmethod
def _loadTileTable(arg1, arg2):
    pass # blah blah
ImageLoader = type('ImageLoader', (), {'TileTable': TileTable, '_loadTileTable': _loadTileTable})
del TileTable
del _loadTileTable

As you can see, the call of _loadTileTable appears before the definition of it. In your example, within the class definition, the call to _loadTileTable must come after the definition of _loadTileTable.

One possible fix is to simply re-arrange the class definition.

class ImageLoader:
    def _loadTileTable(arg1, arg2):
        pass # blah, blah

    TileTable = _loadTileTable('image path', other_var)

Note that I removed the 'staticmethod', because at the point where _loadTileTable is called, it's being called as a function and not a method. If you really want it to be available after class initialization, you can define it as a static method after the fact.

class ImageLoader:
    def _loadTileTable(arg1, arg2):
        pass # blah, blah

    TileTable = _loadTileTable('image path', other_var)

    _loadTileTable = staticmethod(_loadTileTable)