传递类的函数作为参数以在类列表上调用它

Question

I'm trying to call functions of a list of classes of the same type using a function. I want this, because I have to loop over several objects and do the same operation on each of them, and I have several differing functions running such a for loop.

Given this:

def make_timeSeries(symbol):
    return pandas.DataFrame(symbol) # Pseudo-code; But the return value is a pd.DataFrame Object nonetheless.

Class TimeSeries:
    def __init__(self, symbol):
        self.series = make_timeSeries(symbol)

    def get_y_of_day(self, day, _type):
    # Returns a y value for a given X (date) value from a timeline.
        if isinstance(day, str):
            day = funcs.convert_str_to_datetime(day)
        return self.series[(self.series['Date'] >= day) &
                           (self.series['Type'] ==
                            _type)].head(1)['Value'].values[0]

Class Market:
    def __init__(self, symbols):
        self.instruments = {}
        for symbol in symbols:
            self.instruments[symbol] = TimeSeries(make_timeSeries(symbol))

    def _market_day_apply_funcs(self, func, func_list=None, *args):
    # calls a given class function of TimeSeries for each TimeSeries stored in self.instruments
        ys = []
        for symbol in self.instruments:
            ys.append(self.instruments[symbol].func(args))
        if func_list is None:
            return ys
        else:
            return func_list(ys)

    def market_ys_of_day(self, day, _type):
    # Masking function, returns a list of all instruments at the given X (Date) value.
        return self._market_day_apply_funcs(get_y_of_day, day, _type)

I'm calling it then as follows:

print(market.market_ys_of_day('2016-2-1', 'vola'))

This, however raises a NameError :

Traceback (most recent call last):
  File "/markets.py", line 73, in <module>
    print(market.market_ys_of_day('2016-2-1', 'vola'))
  File "/markets.py", line 38, in market_ys_of_day
    return self._market_day_apply_funcs(get_y_of_day, day, _type)
NameError: name 'get_y_of_day' is not defined

I'm assuming the way to resolve this Error would be to pass the entirety of self.instruments[symbol].func , but that would defeat the purpose of the function itself, which is to not have a repeating for loop in each market_day_* function.

Anyone know a solution for this?

Edit It may be of interest to state that my IDe highlights the func argument as not used in the function's scope. Extra credit if anyone can explain that bit as well.

Answer 1

So far as I can see:

ys.append(self.instruments[symbol].func(args))

should be:

ys.append(func(args))

and

return self._market_day_apply_funcs(get_y_of_day, day, _type)

should be:

return self._market_day_apply_funcs(TimeSeries.get_y_of_day, day, _type)