How to flatten nested lists in python

flattening a nested list means converting a list of lists into a single flat list that contains all the elements from the nested lists without any nesting. there are several ways to flatten a nested list in python, and here we will cover two common methods: using list comprehension and the `itertools` module.

method 1: using list comprehension
list comprehension is a concise way to create lists in python. we can use list comprehension to iterate over the nested lists and flatten them into a single list.

here is the code example:

output:

in this code snippet, the list comprehension iterates over each sublist in the `nested_list` and then iterates over each element in the sublist, flattening the nested list into a single flat list.

the `itertools` module in python provides a `chain` function that can be used to flatten nested lists efficiently.

here is the code example:

output:

both methods achieve the same result of flattening a nested list into a single flat list, and you can choose the one that suits your coding style and requirements.

...

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