Simple Python recursive function to flatten any iterable nested object to unit-depth iterable of desired type

flatten_iterables.py

def flatten(*parents, dtype=tuple):
    # internally, lists are used because they can be easily merged and expanded
    result = list()
    for i in range(len(parents)):
        try:
            # if i-th element iterable, use recursion to flatten all its elements and merge the result with current return list
            result.extend(flatten(*parents[i], dtype=list))
        except TypeError: 
            # if not iterable, add the element to return list
            result.append(parents[i])
    # transform to desired return type (dtype argument)
    return dtype(result)
  
if __name__ == "__main__":
    # example
    import numpy as np
    print(flatten([1], [2,[3]], 4, [[[5]],6,[7]], dtype=np.array)) # prints: array([1, 2, 3, 4, 5, 6, 7])