python txt中删除带星号的行

with open('123.txt','r',encoding='gbk')as f:
    lines = f.readlines()
ge = ['*','&']
new = ''
for line in lines:
    mode = True
    for i in ge:
        if i in line:
            mode = False
            break
    if mode:
        new += line
with open('123.txt','w')as f:
    f.write(new)