Text manipulation in Python -

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i have following list in python :

[{"coefficient": -1.0, "compartment": "c", "molecule": "a", "evidence": []},   {"coefficient": -1.0, "compartment": "c", "molecule": "b", "evidence": []},  {"coefficient": -1.0, "compartment": "c", "molecule": "c", "evidence": []},   {"coefficient": 1.0, "compartment": "c", "molecule": "d", "evidence": []},   {"coefficient": 1.0, "compartment": "c", "molecule": "e", "evidence": []},   {"coefficient": 1.0, "compartment": "c", "molecule": "f", "evidence": []}]

i want convert :

a + b + c --> d + e + f

which easiest way in python?

the rules are:

  • if coefficient negative, want treat corresponding molecule reactant.
  • if coefficient positive, want treat corresponding molecule product.
  • reactants come on left hand side of --> mark.
  • products come on right hand side of --> mark.

the following should do:

l = [{"coefficient": -1.0, "compartment": "c", "molecule": "a", "evidence": []},       {"coefficient": -1.0, "compartment": "c", "molecule": "b", "evidence": []},      {"coefficient": -1.0, "compartment": "c", "molecule": "c", "evidence": []},       {"coefficient": 1.0, "compartment": "c", "molecule": "d", "evidence": []},       {"coefficient": 1.0, "compartment": "c", "molecule": "e", "evidence": []},       {"coefficient": 1.0, "compartment": "c", "molecule": "f", "evidence": []}]  def format_mol_list(molecules):     # create lists hold molecules of each type, in order     reactants = []     products = []      # sort items reactants , products     item in molecules:        if item["coefficient"] > 0:           products.append(item["molecule"])        else:           reactants.append(item["molecule"])      return " + ".join(reactants) + " --> " + " + ".join(products)  print format_mol_list(l)

output:

a + b + c --> d + e + f

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