Part I

Write a Python function for scoring a sequence alignment. The
function would be defined as

def score(aligned_seq1, aligned_seq2, m, mm, g):

where aligned_seq1 and aligned_seq2 are aligned strings, m is the match
cost such as 10, mm is the mismatch cost such as 2, and g is the
gap cost such as -2. 

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Part II

Write a Python script that reads in two unaligned sequences in FASTA
format from a file called "dna_fasta.txt", produces a random alignment,
and then prints the score of the alignment with the function you wrote
above. Use the functions we wrote in class to solve this. 

Submit a hardcopy on Feb 6th in class.