Flatten an irregular list of lists

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Yes, I know this subject has been covered before (here, here, here, here), but as far as I know, all solutions, except for one, fail on a list like this:

``````L = [[[1, 2, 3], [4, 5]], 6]
``````

Where the desired output is

``````[1, 2, 3, 4, 5, 6]
``````

Or perhaps even better, an iterator. The only solution I saw that works for an arbitrary nesting is found in this question:

``````def flatten(x):
result = []
for el in x:
if hasattr(el, "__iter__") and not isinstance(el, basestring):
result.extend(flatten(el))
else:
result.append(el)
return result

flatten(L)
``````

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Flatten an irregular list of lists __del__: Questions

How can I make a time delay in Python?

I would like to know how to put a time delay in a Python script.

2973

``````import time
time.sleep(5)   # Delays for 5 seconds. You can also use a float value.
``````

Here is another example where something is run approximately once a minute:

``````import time
while True:
print("This prints once a minute.")
time.sleep(60) # Delay for 1 minute (60 seconds).
``````

2973

You can use the `sleep()` function in the `time` module. It can take a float argument for sub-second resolution.

``````from time import sleep
sleep(0.1) # Time in seconds
``````

Flatten an irregular list of lists __del__: Questions

How to delete a file or folder in Python?

How do I delete a file or folder in Python?

2639

`Path` objects from the Python 3.4+ `pathlib` module also expose these instance methods:

We hope this article has helped you to resolve the problem. Apart from Flatten an irregular list of lists, check other __del__-related topics.

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Javier Zelotti

Shanghai | 2022-11-28

Maybe there are another answers? What Flatten an irregular list of lists exactly means?. I am just not quite sure it is the best method

Julia Sikorski

San Francisco | 2022-11-28

sin is always a bit confusing 😭 Flatten an irregular list of lists is not the only problem I encountered. I just hope that will not emerge anymore

Angelo Emmerson

Prague | 2022-11-28

Simply put and clear. Thank you for sharing. Flatten an irregular list of lists and other issues with hasattr was always my weak point 😁. Checked yesterday, it works!

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