generate function during executing

test.py

def dynamic_generated_fn():
    created_fns = {}

    fn_code = """def {name}(x):
    return x + '_called_by_{name}'"""

    fn_name1 = 'foo'
    fn_name2 = 'bar'

    exec(fn_code.format(name=fn_name1), {}, created_fns)
    print(created_fns[fn_name1]('test'))

    exec(fn_code.format(name=fn_name2), {}, created_fns)
    print(created_fns[fn_name2]('test'))


def dynamic_generated_fn_error():
    created_fns = {}

    fn_code = """def {name}(x):
    raise RuntimeError('{name}')"""

    fn_name = 'foo'

    exec(fn_code.format(name=fn_name), {}, created_fns)
    print(created_fns[fn_name]('test'))


def dynamic_generated_fn_in_fn_error():
    created_fns = {}

    def add_phrase(x):
        return x + '_add'

    fn_code = """def {name}(x):
    return add_phrase(x)"""

    fn_name = 'foo'

    exec(fn_code.format(name=fn_name), {}, created_fns)
    print(created_fns[fn_name]('test'))


def dynamic_generated_fn_in_fn():
    created_fns = {}

    def add_phrase(x):
        return x + '_add'

    import functools
    fn_code = """def {name}(fn, x):
    return fn(x)"""

    fn_name = 'foo'

    exec(fn_code.format(name=fn_name), {}, created_fns)
    generated_fn = functools.partial(created_fns[fn_name], add_phrase)
    print(generated_fn('test'))


if __name__ == '__main__':
    dynamic_generated_fn()

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