Given 2 strings, your job is to find out if there is a substring that appears in both strings. You will return true if you find a substring that appears in both strings, or false if you do not. We only care about substrings that are longer than one letter long.

#Examples:

````
*Example 1*
SubstringTest("Something","Fun"); //Returns false

*Example 2*
SubstringTest("Something","Home"); //Returns true
````
In the above example, example 2 returns true because both of the inputs contain the substring "me". (so**ME**thing and ho**ME**)  
In example 1, the method will return false because something and fun contain no common substrings. (We do not count the 'n' as a substring in this Kata because it is only 1 character long)

#Rules:
Lowercase and uppercase letters are the same. So 'A' == 'a'.  
We only count substrings that are > 1 in length.  

#Input:
Two strings with both lower and upper cases.
#Output:
A boolean value determining if there is a common substring between the two inputs.

Source: codewars | Difficulty: EASY

Starter code: def substring_test(str1, str2):
	

Solutions:
def substring_test(first, second):
	first = first.lower()
	second = second.lower()
	for i in range(len(first) - 2):
		if first[i:i + 2] in second:
			return True
	return False


def substring_test(str1, str2):
	str1 = str1.lower()
	str2 = str2.lower()
	return any((str1[i:i + 2] in str2 for i in range(len(str1) - 1)))


def substring_test(a, b):
	if len(a) > len(b):
		(a, b) = (b, a)
	(a, b) = (a.lower(), b.lower())
	return any((a[i:i + 2] in b for i in range(len(a) - 1)))


def substring_test(*args):
	(shorter, longer) = sorted((a.lower() for a in args), key=len)
	for b in range(len(shorter) - 1):
		if longer.find(shorter[b:b + 2]) != -1:
			return True
	return False


def substring_test(str1, str2):
	(str1, str2) = (str1.lower(), str2.lower())
	s1 = [str1[i:i + 2] for i in range(len(str1) - 1)]
	s2 = [str2[i:i + 2] for i in range(len(str2) - 1)]
	return len(set(s1).intersection(s2)) > 0


from difflib import SequenceMatcher

def substring_test(str1, str2):
	return any((x.size > 1 for x in SequenceMatcher(None, str1.lower(), str2.lower()).get_matching_blocks()))


def substring_test(str1, str2):
	(a, b) = (str1.lower(), str2.lower())
	for i in range(len(a) - 1):
		if a[i:i + 2] in b:
			return True
	return False