Modify the function for computing the Needleman-Wunsch alignment
score to use the BLOSUM62 matrix. The easy way to do this is to read
in the BLOSUM62 matrix from a file and store it as a dictionary. 
Start with the code below:

#Initialize dictionary
blosum_matrix = {}
f = open("BLOSUM_62.txt", "r")
data = f.readlines()

aa = ['', 'A','R','N','D','C','Q','E','G','H','I','L','K','M','F','P','S','T','W','Y','V','B','Z','X']

for j in range(1,len(data),1):
    l = data[j].split()
    for i in range(1,len(l),1):
      #Specify key
      #Specify value
      #Insert (key,value) pair into the dictionary

Submit hardcopies of your modified NWscore function in class on Mar 25th.