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    "# Average amino acid mass (Da)\n",
    "It calculates the average mass of the 20 standar amino acids\n",
    "### Note \n",
    "1 Da = 1.660539 $10^{−27}$  Kg"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "7ce9bc2d-1d4a-472d-908b-f6fbe0df7dd8",
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   "source": [
    "## The mass of the different aminoacids\n",
    "this data structure is a dictionary"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "980d96cb-6eea-4b48-8ac1-587b0587ada5",
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   "source": [
    "amino_acid_masses = {\n",
    "    \"A\": 89.1,  # Alanine\n",
    "    \"R\": 174.2, # Arginine\n",
    "    \"N\": 132.1, # Asparagine\n",
    "    \"D\": 133.1, # Aspartic acid\n",
    "    \"C\": 121.2, # Cysteine\n",
    "    \"Q\": 146.2, # Glutamine\n",
    "    \"E\": 147.1, # Glutamic acid\n",
    "    \"G\": 75.1,  # Glycine\n",
    "    \"H\": 155.2, # Histidine\n",
    "    \"I\": 131.2, # Isoleucine\n",
    "    \"L\": 131.2, # Leucine\n",
    "    \"K\": 146.2, # Lysine\n",
    "    \"M\": 149.2, # Methionine\n",
    "    \"F\": 165.2, # Phenylalanine\n",
    "    \"P\": 115.1, # Proline\n",
    "    \"S\": 105.1, # Serine\n",
    "    \"T\": 119.1, # Threonine\n",
    "    \"W\": 204.2, # Tryptophan\n",
    "    \"Y\": 181.2, # Tyrosine\n",
    "    \"V\": 117.1  # Valine\n",
    "}\n"
   ]
  },
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   "cell_type": "code",
   "execution_count": 2,
   "id": "c73dfe51-58d2-4ab8-a594-2577c70ac50b",
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    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "The mass of Alanine is 89.1 g/mol.\n"
     ]
    }
   ],
   "source": [
    "# Just to see how to access to the mass of one amino acid\n",
    "# Get the mass of Alanine\n",
    "alanine_mass = amino_acid_masses[\"A\"]\n",
    "print(f\"The mass of Alanine is {alanine_mass} g/mol.\")"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "f525c7b9-a2cb-466a-9556-2264c85b9d86",
   "metadata": {},
   "source": [
    "## Calculate the average mass in Da"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "5b8fa130-ef13-4a68-9d19-7e09eb3118d4",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "The average mass of the 20 aa is 136.905 g/mol.\n"
     ]
    }
   ],
   "source": [
    "mass = 0 # Da\n",
    "num = 0\n",
    "for k in amino_acid_masses.keys(): # iterate all over the aa\n",
    "    num = num + 1\n",
    "    mass = mass + amino_acid_masses[k]\n",
    "average_mass = mass/num\n",
    "print(f\"The average mass of the 20 aa is {average_mass} g/mol.\")"
   ]
  },
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   "execution_count": null,
   "id": "1cab9161-0ea2-4413-85a3-fd6b6dc6d569",
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   "source": []
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