Algorithm
Problem Name: Python -
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.
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?
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
lara@hackerrank.com
brian-23@hackerrank.com
britts_54@hackerrank.com
Sample Output
['brian-23@hackerrank.com', 'britts_54@hackerrank.com', 'lara@hackerrank.com']
Code Examples
#1 Code Example with Python Programming
Code -
Python Programming
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