import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
data = get_pricing('MSFT', start_date='2012-1-1', end_date='2015-6-1')
X = data['price']
MAVG = pd.rolling_mean(X, window=50)
plt.plot(X.index, X.values)
plt.plot(MAVG.index, MAVG.values)
plt.ylabel('Price')
plt.legend(['MSFT', '50-day MAVG']);**