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"""EMA indicator."""
import pandas as pd # type: ignore
from ..interfaces import Indicator
class SMA(Indicator):
"""
https://stackoverflow.com/questions/48613151/simple-python-pandas-ema-ewma
"""
def __init__(self, nb_values: int):
"""Save the value."""
super().__init__()
self.nb_values = nb_values
def __call__(self, data: pd.DataFrame) -> pd.Series:
"""Return a dataframe of valuation of each stock from the input data.
Args:
data (DataFrame): Time-Stock valuated candlestick data.
For each time and each stock give (high, low, open, close).
Returns:
DataFrame: Stock valuated float.
For each stock give -1 if realy bad and +1 if realy good.
"""
return data.rolling(self.nb_values).mean().close.loc[data.index[-1][0]]