Validating Email Addresses With a Filter in Python - HackerRank Solution

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1 Oct, 2020

Validating Email Addresses With a Filter in Python - HackerRank Solution

Problem :

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 username@websitename.extension format type.
The username can only contain letters, digits, dashes and underscores.
The website name can only have letters and digits.

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))

Easy, isn't it?

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.

Output Format :

Output a list containing the valid email addresses in lexicographical order. If the list is empty, just output an empty list, [].

Sample Input :

3
lara@hackerrank.com
brian-23@hackerrank.com
britts_54@hackerrank.com

Sample Output :

['brian-23@hackerrank.com', 'britts_54@hackerrank.com', 'lara@hackerrank.com']

Solution :

# Validating Email Addresses With a Filter in Python - Hacker Rank Solution
# Python 3
# Validating Email Addresses With a Filter in Python - Hacker Rank Solution START
def fun(s):
    # return True if s is a valid email, else return False
    try:
        username, url = s.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
# Validating Email Addresses With a Filter in Python - Hacker Rank Solution END
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 whole problem statement is given by hackerrank.com but the solution is generated by the codeworld19 authority if any of the query regarding this post or website fill the following contact form thank you.

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Hey, I am Parthe Omkar

Validating Email Addresses With a Filter in Python - HackerRank Solution

Problem :

Input Format :

Constraints :

Output Format :

Sample Input :

Sample Output :

Solution :

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