How do I convert a tuple of tuples to a one-dimens

Question

This question already has an answer here:

• Flattening a shallow list in Python [duplicate] 23 answers

I have a tuple of tuples - for example:

tupleOfTuples = ((1, 2), (3, 4), (5,))

I want to convert this into a flat, one-dimensional list of all the elements in order:

[1, 2, 3, 4, 5]

I've been trying to accomplish this with list comprehension. But I can't seem to figure it out. I was able to accomplish it with a for-each loop:

myList = []
for tuple in tupleOfTuples:
   myList = myList + list(tuple)

But I feel like there must be a way to do this with a list comprehension.

A simple [list(tuple) for tuple in tupleOfTuples] just gives you a list of lists, instead of individual elements. I thought I could perhaps build on this by using the unpacking operator to then unpack the list, like so:

[*list(tuple) for tuple in tupleOfTuples]

or

[*(list(tuple)) for tuple in tupleOfTuples]

... but that didn't work. Any ideas? Or should I just stick to the loop?

Answer 1

For multilevel, and readable code:

def flatten(bla):
    output = []
    for item in bla:
        output += flatten(item) if hasattr (item, "__iter__") or hasattr (item, "__len__") else [item]
    return output

I could not get this to fit in one line (and remain readable, even by far)