Turbulent waves - multiple moving averages

This is not investment advice.

In technical analysys for stock price evaluation there are few significant moving averages that tend to work as rather strong support and resistance levels.

Some of the popular ones are 21, 50, 100, 150, 200 datapoint (day, hour) moving averages.

But there is alternative approach. We can create series of multiple moving averages and plot them alongside the price chart.

When price is approaching these multiple layers from above, they act as support. And conversely when price is below them, they act as resistance. The more layers the price goes through, the more significant support/resistance becomes.

In this script we are using exponentially weighted moving average (EMA).

from IPython.core.display import display, HTML
display(HTML("<style>.container { width:100% !important; }</style>"))
%matplotlib inline

from IPython.display import set_matplotlib_formats
set_matplotlib_formats('retina')

import sys
import os

# ___library_import_statements___
import pandas as pd

# for pandas_datareader, otherwise it might have issues, sometimes there is some version mismatch
pd.core.common.is_list_like = pd.api.types.is_list_like

# make pandas to print dataframes nicely
pd.set_option('expand_frame_repr', False)

import pandas_datareader.data as web
import numpy as np
import matplotlib.pyplot as plt
import datetime
import time

#newest yahoo API
import yfinance as yahoo_finance

#                           ___variables___
# ------------------------------------------------------------------------------

#ticker = 'AAPL'
#ticker = 'TSLA'
ticker = 'FB'
#ticker = 'AMZN'
#ticker = 'SPY'
#ticker = 'QQQ'


start_time = datetime.datetime(2017, 10, 1)
#end_time = datetime.datetime(2019, 1, 20)
end_time = datetime.datetime.now().date().isoformat()     # today

#                       __function_definitions__
# ------------------------------------------------------------------------------

def get_data(ticker):
    # yahoo gives only daily historical data
    attempts = 0
    connected = False
    while not connected:
        try:
            ticker_df = web.get_data_yahoo(ticker, start=start_time, end=end_time)
            connected = True
            print('connected to yahoo')
        except Exception as e:
            print("type error: " + str(e))
            time.sleep( 5 )
            attempts += 1
            if attempts >= 10:
                connected = True
            pass

    # use numerical integer index instead of date
    ticker_df = ticker_df.reset_index()
    #print(ticker_df.head(5))

    return ticker_df

def computeEMA(data, span):
    # simple moving average
    ema = data.ewm(span=span, adjust=False).mean()

    return ema

def construct_df(ticker):
    #get data from yahoo API
    df = get_data(ticker)
    # compute both types of moving averages
    for i in range(20, 210, 10):
        #print(i)
        df['EMA_{}'.format(i)] = computeEMA(df['Adj Close'], i)
    
    return df    
        

def plot_data_EMA(df):
    plt.figure(figsize=(15,7))
    plt.title('Price chart (Adj Close) ' + ticker)
    plt.plot(df['Adj Close'])

    for i in range(20, 210, 10):
        # 
        alpha = i / 500.
        plt.plot(df['EMA_{}'.format(i)], alpha=alpha)

    plt.legend(loc='upper left')
    plt.show()   

df = construct_df(ticker)

connected to yahoo

plot_data_EMA(df)