Call a function name from dictionary map

Question

I want to call a function dynamically, but I didn't success.

available.append({
     'analysis_name': 'Category X Total Payment',
     'col_name': 'VALUE',
     'required_cols': ['Category','VALUE'],
     'agg':'SUM',
     'analysis_type': 'pareto-bar',
     'func': 'draw_pareto'})
available.append({
    'analysis_name': 'Category X Count',
    'col_name': 'Count',
    'required_cols': ['Category','VALUE'],
    'agg':'Count',
    'analysis_type': 'pareto-bar',
    'func': 'draw_pareto'})

I have an array which is mapping function names, and I want to call the function by user option like this:

def runAnalysis(self, analysis):
    required_cols = analysis['required_cols']
    agg = analysis['agg']
    col_name = analysis['col_name']
    analysis['data'] = self.draw_pareto(required_cols[0], required_cols[1], agg, col_name) // this line must be dynamically
    return analysis['data']

user9455968 · Accepted Answer · 2018-03-21 11:17:40Z

1

Change your data to contain the function:

available.append({
    'analysis_name': 'Category X Count',
    'col_name': 'Count',
    'required_cols': ['Category','VALUE'],
    'agg':'Count',
    'analysis_type': 'pareto-bar',
    'func': self.draw_pareto})

Then call it:

analysis['data'] = analysis['func'](required_cols[0], required_cols[1], agg, col_name) // this line must be dynamically

answered Mar 21, 2018 at 11:17

user9455968

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Matan Shahar · Accepted Answer · 2018-03-21 11:18:44Z

1

In python everything (classes, functions etc) is an object, if you want a dict to map from keys to functions use function objects.

def test():
    map = { 'a': func1, 'b': func2 }
    map['a']()

def func1(): pass
def func2(): pass

answered Mar 21, 2018 at 11:18

Matan Shahar

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Comments

tobias_k · Accepted Answer · 2018-03-21 11:22:03Z

1

If you can not change the dictionary to contain the function itself, instead of it's name, as suggested in other answers, when you can use getattr to get the function corresponding to the name:

func = getattr(self, analysis['func'])
analysis['data'] = func(required_cols[0], required_cols[1], agg, col_name)

answered Mar 21, 2018 at 11:22

tobias_k

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