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Ralsina.Me — Roberto Alsina's website (Source)

from tokenize import generate_tokens
cells = ["A1=A3+A2", "A2=2", "A3=4"]
values = {}
def get_dep(formula):
    """Given a formula, return the names of the cells referenced."""
    deps = {}
        for token in generate_tokens([formula].pop):
            if token[0] == 1:  # A variable
                deps[token[1]] = None
    except IndexError:
        # It's ok
    print deps
    return {
        'result_dep': ['calculate:%s' % key for key in deps.keys()]
def task_get_dep():
    for cell in cells:
        name, formula = cell.split('=')
        yield {
            'name': formula,
            'actions': [(get_dep, (formula,))],
def evaluate(name, formula):
    value = eval(formula, values)
    values[name] = value
    print "%s = %s" % (name, value)
def task_calculate():
    for cell in cells:
        name, formula = cell.split('=')
        yield {
            'calc_dep': ['get_dep:%s' % formula],
            'actions': [(evaluate, (name, formula))],