Problem Name: Python - Validating Email Addresses With a Filter

Problem Link:  

In this HackerRank Functions in PYTHON problem solution,

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 [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))


Easy, isn't it?




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

Input Format

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.

Sample Input


Sample Output

['', '', '']




Code Examples

#1 Code Example with Python Programming

Code - Python Programming

def fun(email):
        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
        return True
Copy The Code & Try With Live Editor


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