步骤：提取脑波信号（Alpha、Beta、Delta、Theta）

    import os
    from process_eeg import iir,processing
    import pandas as pd
    import numpy as np
    def mkdir(path_3):
    folder = os.path.exists(path_3)
    if not folder:  # 判断是否存在文件夹如果不存在则创建为文件夹
        os.makedirs(path_3)  # makedirs 创建文件时如果路径不存在会创建这个路径
        print("---  new folder...  ---")
        print("---  OK  ---")
    else:
        print("---  There is this folder!  ---")
    
    def brain_main():
    Delta_Power = [];Theta_Power = [];Alpha_Power = [];Beta_Power = []
    brain_data = pd.DataFrame(pd.read_csv(eeg_path + Name, encoding='CP949', engine