Given an arbitrary ransom note string and another string containing letters from all the magazines, write a function that will return true if the ransom 
note can be constructed from the magazines ; otherwise, it will return false. 
Each letter in the magazine string can only be used once in your ransom note.
Note:
You may assume that both strings contain only lowercase letters.
canConstruct("a", "b") -> false
canConstruct("aa", "ab") -> false
canConstruct("aa", "aab") -> true
class Solution:
     def canConstruct(self, ransomNote, magazine):
         """
         :type ransomNote: str
         :type magazine: str
         :rtype: bool
         """
         for i in set(ransomNote):
             if ransomNote.count(i) > magazine.count(i):
                 return False
         return True
class Solution:
     def canConstruct(self, ransomNote, magazine):
         """
         :type ransomNote: str
         :type magazine: str
         :rtype: bool
         """
         for i in set(ransomNote):
             if ransomNote.count(i) > magazine.count(i):
                 return False
         return True