[C4D] This script contains two generator functions that allow you to effortlessly iterate over objects hierarchies in Cinema 4D, as well as some simple testing code that will iterate the hierarchy of the current document (starting form the selected object), and print it to the console.

c4d-hierarchy-iterating-generators.py

import c4d

"""
This script demonstrates two generator functions, AllChildren() and AllParents().
To test this, use any scene with a reasonably complex hierarchy, select any one object and run the script.
"""

def AllChildren(startOp, maxDepth = 0, currentRecursionDepth = 1):
    """Yield all objects that are part of startOp's child hierarchy.
    Set maxDepth to a value != 0 to restrict recursion to a certain depth.
    """
    # Start with first child
    op = startOp.GetDown()

    # Iterate over child's siblings
    while op:
        yield op

        # If maxRecursionDepth is 0, or hasn't been reached
        # yet, iterate over each sibling's children
        if maxDepth == 0 or (currentRecursionDepth < maxDepth):
            for child in AllChildren(op, maxDepth = maxDepth, currentRecursionDepth = currentRecursionDepth + 1):
                yield child

        op = op.GetNext()


def AllParents(startOp, maxDepth = 0):
    """Yield all parent objects of startOp.
    Set maxDepth to a value != 0 to restrict the amount of iterated parent levels.
    """
    # Start with first parent
    op = startOp.GetUp()

    # Iterate over parent's parents
    currentDepth = 1
    while op:
        if maxDepth != 0 and (currentDepth > maxDepth):
            break

        yield op

        currentDepth += 1
        op = op.GetUp()


if __name__=='__main__':
    # Get start object and print something
    startObject = doc.GetActiveObject()
    print('Children of ' + startObject.GetName() + ':')

    # Iterate children and print their names
    for obj in AllChildren(startOp = startObject, maxDepth = 0):
        print(obj.GetName())

    # Some more printing
    print(' ')
    print('Parents of ' + startObject.GetName() + ':')

    # Iterate parents and print their names
    for obj in AllParents(startOp = startObject, maxDepth = 0):
        print(obj.GetName())