runtimequestion 317 Iterators & Generators · medium
Flatten nested lists
Tag lists from different sources arrive nested to different depths: ["python", ["data", ["pandas", "numpy"]], ("web",)]. Write flatten(value): return a flat list of every item that isn't a list or tuple, in order, however deep the nesting. Strings and dictionaries are items, not containers.
Function
flatten(value)valuea list or tuple whose items may be lists or tuples again
Returnsa new list of the non-container items, depth first, in order
Examples
callflatten(['python', ['data', ['pandas', 'numpy']], ['web']])returns['python', 'data', 'pandas', 'numpy', 'web']
callflatten([1, [2, [3, [4, [5]]]]])returns[1, 2, 3, 4, 5]
callflatten([])returns[]