python itertools groupby example

in this tutorial, we will explore the groupby() function in detail, along with examples to demonstrate its usage.
it's important to note that the groupby() function works best when the input iterable is sorted based on the key function. otherwise, the results may not be as expected.
let's start with a simple example where we have a list of numbers, and we want to group consecutive numbers based on whether they are even or odd.
output:
in this example, we grouped consecutive numbers based on whether they are even or odd. the key function (lambda x: x % 2 == 0) returns true if the number is even, and false otherwise.
now, let's consider a list of strings and group them based on their first letter.
output:
in this example, we grouped the strings based on their first letter using the key function lambda x: x[0].
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