In the context of this exercise, how does the lambda function in the example work?
In this exercise, the lambda function given in the example was
lambda x: x.split('@')[-1]
A quick explanation of what this lambda function will do is, it will take in a string input value, which will be an Email address like
"firstname.lastname@example.org", and return the Email provider,
To better understand how it accomplishes this, let’s work through each part:
First, it will use
.split() to “split” the inputted string on the delimiter
'@'. In Python, this will return a new list with the string split into substrings separated on any
"@" which were in the string. So, given
x = "email@example.com"
returns the list
Finally, the function will access the last element of this list, using index
-1. If you recall, we can use negative index values to select elements from the last position, where
-1 selects the last element,
-2 selects the second to last, and so on.
# x = "firstname.lastname@example.org" x.split('@')[-1] # = ['john.smith', 'gmail.com'][-1] # = 'gmail.com'