# Validating Email Addresses With a Filter in Python HackerRank Solution

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

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## 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 [email protected] 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.
Letā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, isnā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 :

`['[email protected]', '[email protected]', '[email protected]']`

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

```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:Ā The above ProblemĀ (Validating Email Addresses With a Filter in Python )Ā is generated byĀ Hackerrank but the Solution is Provided byĀ Chase2Learn. This tutorial is only forĀ EducationalĀ andĀ LearningĀ purposes. Authority if any of the queries regarding this post or website fill the following contact form thank you.

### FAQ:

#### Does HackerRank have Python?

HackerRankās programming challenges can be solved in a variety of programming languages (including Java, C++, PHP, Python, SQL, JavaScript)Ā and span multiple computer science domains.

#### Where can I practice Python coding?

• HackerRank is a great site for practice thatās also interactive.

#### Where can I find HackerRank solutions in Python?

in this post, you will get all theĀ solutionsĀ toĀ HackerRank PythonĀ Problems.

#### Is possible HackerRank Solution in Python?

HackerRankās programming challenges can be solved in a variety of programming languages (including Java, C++, PHP, Python, SQL, and JavaScript) and span multiple computer science domains. When a programmer submits a solution to a programming challenge, their submission is scored on the accuracy of their output.

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