def return_list_smart(lst):

If the list has length > returns the list
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if it has length == 1 it returns the element
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if it has length == 0 it returns None

def return_dict_smart(dct):

def get_coords(obj, mirror=False, mirror_ax='x'):

Takes coordinates in various format and turns them into what's
    expected from VTK plotter for rendering.
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Can take a dict, Pandas Dataframe or Series
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:param obj: dict, pandas.DataFrame or pandas.Series
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:param mirror:  if True, the coordinates are mirrored around mirror_ax
    (Default value = False)
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:param mirror_ax: ax to be used for mirroring ['x', 'y', 'z'] (Default
    value = 'x')

def flatten_list(lst):

Flattens a list of lists
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:param lst: list

def is_any_item_in_list(L1, L2):

Checks if an item in a list is in another  list
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:param L1:
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:param L2:

def get_slice_coord(bounds, n):

Given the bounds of an actor, return the point that
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corresponds to the n% of the bounds range
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:param bounds: should be a list of two floats
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:param n: n should be a float in range 0, 1