import matplotlib.pyplot as plt
from Investar import Analyzer
mk = Analyzer.MarketDB()
df = mk.get_daily_price('NAVER', '2019-01-02')
df['MA20'] = df['close'].rolling(window=20).mean()
df['stddev'] = df['close'].rolling(window=20).std()
df['upper'] = df['MA20'] + (df['stddev'] * 2)
df['lower'] = df['MA20'] - (df['stddev'] * 2)
df = df[19:]
plt.figure(figsize=(9, 5))
plt.plot(df.index, df['close'], color='#0000ff', label='Close')
plt.plot(df.index, df['upper'], 'r--', label='Upper band')
plt.plot(df.index, df['MA20'], 'k--', label='Moving average 20')
plt.plot(df.index, df['lower'], 'c--', label='Lower band')
plt.fill_between(df.index, df['upper'], df['lower'], color='0.9')
plt.legend(loc='best')
plt.title('NAVER Bollinger Band(20 day, 2 std)')
plt.show()
def __init__(self):
"""생성자: KRX 종목코드(codes)를 구하기 위한 MarkgetDB 객체 생성"""
self.mk = Analyzer.MarketDB()