Issue with def function

Question

I'm trying to create Exponential Moving average. However, the error code 'Series' object is not callable' appeared. This is my code. Can someone help?

def CalculateEMA(window):

    sma = Close.rolling(window, min_periods=window).mean()[:window]
    rest = Close[window:]
    EMA_window=pd.concat([sma, rest]).ewm(span=window, adjust=False).mean()

    return EMA_window()
CalculateEMA(60)

Answer 1

You are calling the pandas.Series that is returned from the mean method. This doesnt make any sense and since Series doesn't implement __call__ it fails with an error.

What you probably want to do is remove the parens and just return the Series itself.

def CalculateEMA(window):

    sma = Close.rolling(window, min_periods=window).mean()[:window]
    rest = Close[window:]
    EMA_window=pd.concat([sma, rest]).ewm(span=window, adjust=False).mean()

    return EMA_window # <-- changed here
CalculateEMA(60)