Hello coders, today we are going to solve Validating Email Addresses With a Filter HackerRank Solution in Python.
Task
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.
Concept
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))Example
Complete the function fun in the editor below.
fun has the following paramters:
- string s: the string to test
Returns
- boolean: whether the string is a valid email or not
Input Format
The first line of input is the integer N, the number of email addresses.
N lines follow, each containing a string.
Constraints
Each line is a non-empty string.
Sample Input
3
[email protected]
[email protected]
[email protected]Sample Output
['[email protected]', '[email protected]', '[email protected]']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.