parse.py

def format_compound(formula):
    f_formula = ""
    for part in formula.split("."):
        for i in range(0, len(part)):
            if i + 1 < len(part):
                if part[i].isalpha() and (part[i + 1].isupper() or part[i + 1] in ["(", "[", ")", "]"]):
                    f_formula += part[i] + "1"
                elif part[i] in [")", "]"] and part[i + 1].isalpha():
                    f_formula += part[i] + "1"
                else:
                    f_formula += part[i]
            else:
                if part[i].isalpha() or part[i] in [")", "]"]:
                    f_formula += part[i] + "1"
                else:
                    f_formula += part[i]
        f_formula += ("." if len(formula.split(".")) > 1 else "")
    if f_formula.find(".") > -1:
        part = f_formula.split(".")
        val = str(re.findall('[0-9][0-9]*', part[1])[0])
        val = ("1" if val == "" else val)
        f_formula = part[0] + \
            "(" + str(re.findall('[A-Za-z]\S*', part[1])[0]) + ")" + val
    return f_formula