python table转空格

有需求：

预留，先上代码：

 import os

 def Table_Space(file_name,lis_out,tab_num = 4):
     file_str = open(file_name,"r").read()
     if "\t" in file_str:
         lis_out.append(file_name)
         print(file_name)
         open(file_name,"w").write(file_str.expandtabs(tab_num))

 def Cyc_Fold(Fold_F,list_out):
     for i in os.listdir(Fold_F):
         if os.path.isdir(os.path.join(Fold_F,i)):
             Cyc_Fold(os.path.join(Fold_F,i),list_out)
         if os.path.isfile(os.path.join(Fold_F,i)) and (i.startswith("app") or i.startswith("hmi")) and (i.endswith(".c") or i.endswith(".h")):
             Table_Space(os.path.join(Fold_F,i),list_out)

 if __name__ == "__main__":
     list_out = []
     Fold_in = input("Please input folder:")
     Cyc_Fold(Fold_in,list_out)
     file_out_name = os.path.join(Fold_in,"Modify_out.txt")
     file_out = open(file_out_name,"w")
     for i in list_out:
         file_out.write(i + "\n")
     file_out.close()