Question

I have this function (includes description):

def deep_list(x):
    """fully copies trees of tuples to a tree of lists.
    deep_list( (1,2,(3,4)) ) returns [1,2,[3,4]]"""
    if type(x)!=type( () ):
        return x
    return map(deep_list,x)

I would like to insert that function into a functions class I’ve made, so I need to add self to the function arguments at the beginning.

My problem is this:
How do I insert in the right way self to the ‘map’ function in the end of the deep_list?

Answer 1

Depends how x relates to your class.

One way is to make the function a static method. This is probably the least likely

@staticmethod
def deep_list(x):
    """fully copies trees of tuples to a tree of lists.
       deep_list( (1,2,(3,4)) ) returns [1,2,[3,4]]"""
    if type(x)!=type( () ):
        return x
    return map(deep_list,x)

If you mean to operate on an attribute, then do it this way

def deep_list(self):
    """fully copies trees of tuples to a tree of lists.
       deep_list( (1,2,(3,4)) ) returns [1,2,[3,4]]"""
    if type(self.x)!=type( () ):
        return self.x
    return map(deep_list, self.x)

Finally, if you are subclassing list or making a sequence like class, you may just use self

def deep_list(self):
    """fully copies trees of tuples to a tree of lists.
       deep_list( (1,2,(3,4)) ) returns [1,2,[3,4]]"""
    if type(self)!=type( () ):
        return self
    return map(deep_list, self)