Hello coders, today we are going to solve Validating Email Addresses With a Filter HackerRank Solution in Python.
You are given an integer N followed by N email addresses. Your task is to print a list containing only valid email addresses in lexicographical order.
Valid email addresses must follow these rules:
- It must have the [email protected] format type.
- The username can only contain letters, digits, dashes and underscores [a – z], [A – Z], [0 – 9], [_-].
- The website name can only have letters and digits [a – z], [A – Z], [0 – 9].
- The extension can only contain letters [a – z], [A – Z].
- The maximum length of the extension is 3.
A filter takes a function returning True or False and applies it to a sequence, returning a list of only those members of the sequence where the function returned True. A Lambda function can be used with filters.
Let’s say you have to make a list of the squares of integers from 0 to 9 (both included).
>> l = list(range(10)) >> l = list(map(lambda x:x*x, l))
Now, you only require those elements that are greater than 10 but less than 80.
>> l = list(filter(lambda x: x > 10 and x < 80, l))
Complete the function fun in the editor below.
fun has the following paramters:
- string s: the string to test
- boolean: whether the string is a valid email or not
The first line of input is the integer N, the number of email addresses.
N lines follow, each containing a string.
Each line is a non-empty string.
Solution – Validating Email Addresses With a Filter
def fun(email): try: username, url = email.split('@') website, extension = url.split('.') except ValueError: return False if username.replace('-', '').replace('_', '').isalnum() is False: return False elif website.isalnum() is False: return False elif len(extension) > 3: return False else: return True def filter_mail(emails): return list(filter(fun, emails)) if __name__ == '__main__': n = int(input()) emails =  for _ in range(n): emails.append(input()) filtered_emails = filter_mail(emails) filtered_emails.sort() print(filtered_emails)
Disclaimer: The above Problem (Validating Email Addresses With a Filter) is generated by Hacker Rank but the solution is Provided by CodingBroz. This tutorial is only for Educational and Learning Purpose.