storing_test.py 文件源码

def appends():
    filename = 'c:/day/bigfile.csv'
    for code in ['000875', '600848', '000981']:
        df = ts.get_hist_data(code)
        if os.path.exists(filename):
            df.to_csv(filename, mode='a', header=None)
        else:
            df.to_csv(filename)