How can I flatten a list of floats in python without using numpy?

Question

[1.0, [1.0, [1.0, [0.25, [0.05, [0.01, [0.01, 0.01]]]]]]]

I am trying to flatten this list in python without using any modules not built into python 2. When I try to flatten it this error is raised:

 TypeError: 'float' object is not iterable on line 19

possibly: https://stackoverflow.com/questions/952914/how-to-make-a-flat-list-out-of-list-of-lists — 7 Reeds, Jan 15 '20 at 20:49
Tried that- didn't work. Apparently floats are different and also I'm using Python 2. This question is not a duplicate... I have seen that thread and the method used there does not work for me. — myang0630, Jan 15 '20 at 20:50
Showing an error message is only helpful if we also see the code that it corresponds to. Otherwise the best we can tell you is that there is something wrong with the code, as described in the error. — Karl Knechtel, Sep 07 '22 at 07:31

score 2 · Accepted Answer · answered Jan 15 '20 at 20:47

2

You can use recursion to flatten nested list:

def flatten(lst):
    for i in lst:
        if isinstance(i, list):
            for v in flatten(i):
                yield v
        else:
            yield i

lst = [1.0, [1.0, [1.0, [0.25, [0.05, [0.01, [0.01, 0.01]]]]]]]

lst = list(flatten(lst))
print(lst)

Prints:

[1.0, 1.0, 1.0, 0.25, 0.05, 0.01, 0.01, 0.01]

answered Jan 15 '20 at 20:47

Andrej Kesely

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1

Thanks for helping me, it worked – myang0630 Jan 15 '20 at 20:54
1

@HeapOverflow Yes, `yield from` was my first thought - but OP wants Python 2 solution, so I did it only with `yield` – Andrej Kesely Jan 15 '20 at 20:58

How can I flatten a list of floats in python without using numpy?

1 Answers1