title: summing dictionary values from reading another file
body: <p>My assignment is to:</p>
  
  <pre><code>Read the protein sequence from FILE A and calculate the molecular weight of
  this protein using the dictionary created above.
  </code></pre>
  
  <p>So far, I have the code below:</p>
  
  <pre><code>import pprint
  my_dict= {'A':'089Da', 'R':'174Da','N':'132Da','D':'133Da','B':'133Da','C':'121Da','Q':'146Da','E':'147Da',
            'Z':'147Da','G':'075Da','H':'155Da','I':'131Da','L':'131Da','K':'146Da','M':'149Da',
            'F':'165Da','P':'115Da','S':'105Da','T':'119Da','W':'204Da','Y':'181Da','V':'117Da'}
  new=sorted(my_dict.items(), key=lambda x:x[1])
  print("AA", "  ", "MW")
  for key,value in new:
      print(key, " ", value)
  
  
  with open('lysozyme.fasta','r') as content:
      fasta = content.read()
      for my_dict in fasta:
  </code></pre>
  
  <p>In which the top part of the code is my dictionary created. The task is to i.e open the rile and read 'MWAAAA' in the file, and then sum up the values associated with those keys using the dictionary I created. I'm not sure how to proceed after the for loop. Do I use an append function? Would appreciate any advice, thanks!</p>