Pythonを利用して得られたデータをCSVファイルに保存したい

前提・実現したいこと

PythonでYahoo Finance APIからデータを取得したので、
それをCSVファイルに出力したい。

該当のソースコード

pip install yfinance

import yfinance as yf

data = yf.download(  # or pdr.get_data_yahoo(...
        # tickers list or string as well
        tickers = "4755.T",

        # use "period" instead of start/end
        # valid periods: 1d,5d,1mo,3mo,6mo,1y,2y,5y,10y,ytd,max
        # (optional, default is '1mo')
        period = "2y",

        # fetch data by interval (including intraday if period < 60 days)
        # valid intervals: 1m,2m,5m,15m,30m,60m,90m,1h,1d,5d,1wk,1mo,3mo
        # (optional, default is '1d')
        interval = "1h",

        # group by ticker (to access via data['SPY'])
        # (optional, default is 'column')
        group_by = 'ticker',

        # adjust all OHLC automatically
        # (optional, default is False)
        auto_adjust = True,

        # download pre/post regular market hours data
        # (optional, default is False)
        prepost = True,

        # use threads for mass downloading? (True/False/Integer)
        # (optional, default is True)
        threads = True,

        # proxy URL scheme use use when downloading?
        # (optional, default is None)
        proxy = None
    )

print(data)

出力結果

               Open         High          Low        Close   Volume

Date
2018-08-06 746.200012 765.599976 746.200012 759.900024 0
2018-08-06 759.599976 764.200012 759.400024 764.000000 898700
2018-08-06 764.400024 765.700012 761.700012 761.700012 546500
2018-08-06 761.599976 770.799988 761.599976 768.200012 1328100
2018-08-06 768.099976 770.900024 767.000000 768.000000 1396000
... ... ... ... ... ...
2020-08-05 1046.000000 1053.000000 1044.000000 1051.000000 1076600
2020-08-05 1051.000000 1053.000000 1049.000000 1049.000000 0
2020-08-05 1051.000000 1057.000000 1051.000000 1056.000000 3842500
2020-08-05 1056.000000 1058.000000 1052.000000 1054.000000 594800
2020-08-05 1054.000000 1056.000000 1053.000000 1053.000000 439000