# Validating Email Addresses With a Filter in Python HackerRank Solution

Hello coders, In this post, you will learn how to solve Validating Email Addresses With a Filter in Python HackerRank Solution. This problem is a part of the Python Hacker Rank series.

## 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.
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']`

### Validating Email Addresses With a Filter in Python HackerRank Solution

```def fun(email):
try:
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 in Python) is generated by Hackerrank but the Solution is Provided by Chase2Learn. This tutorial is only for Educational and Learning purposes. Authority if any of the queries regarding this post or website fill the following contact form thank you.

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