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 "	" 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 + "
")
    file_out.close()