[Python] Ravel () is convenient when drawing multiple graphs

When drawing multiple graphs, using raise () makes it easier to control.

Since plt.subplots () creates a two-dimensional array in ʻaxes, you have to nest when drawing a graph with for loop, but if you make it a one-dimensional array with ravel ()`, nesting is unnecessary. ..

python

import pandas_datareader.data as web
import datetime
import matplotlib.pyplot as plt
import seaborn as sns
sns.set()
from pandas.plotting import register_matplotlib_converters
register_matplotlib_converters()

dic = {'Unemployment rate':'UNRATE',
       'USHY spread': 'BAMLH0A0HYM2',
       'CPI':'CPIAUCSL',
       '10 year treasury': 'DGS10',
      'Federal Funds Rate': 'FEDFUNDS',
      'Industrial Production Index':'INDPRO',
      'Household Debt to GDP': 'HDTGPDUSQ163N',
      'Real GDP': 'A191RL1Q225SBEA',
      'WTI oil price': 'WTISPLC',
      'VIX': 'VIXCLS',
      'S&P500': 'SP500'}

source = 'fred'

start = datetime.datetime(2015, 1, 1)
end = datetime.datetime(2020, 5, 1)

h = ((len(dic)+1)//2)*4

fig, axes = plt.subplots(6,2, figsize = (15,h))

for ax, (ttl, symbol) in zip(axes.ravel(),dic.items()):
    dt = web.DataReader(symbol,source, start, end)
    ax.plot(dt)
    ax.set_title(ttl) 
    ax.grid(True)

plt.tight_layout()
plt.savefig('FRED',bbox_inches="tight")