Python字符串加密次数 for循环

Question

我想做一个字符串加密的程序，我想用for循环设置加密次数，可是我用了for循环却不行，求解决方案 谢谢

a=input("请输入您要加密的英文：")
for q in range(2):#设置加密次数
    for i in range(len(a)):
        if (ord(a[i])>=65 and ord(a[i])<=87) or(ord(a[i])>=97 and ord(a[i])<=119):
            m=chr(ord(a[i])+3)
        elif (ord(a[i])>=88 and ord(a[i])<=90) or(ord(a[i])>=120 and ord(a[i])<=122):
            m=chr(ord(a[i])-23)
        else:
            m=a[i]
    print(m,end='')
          

Answer 1

试试这样写：一定要把新的密码在循环之前赋值给a，才能实现循环加密的效果

a=input("请输入您要加密的英文：")
for q in range(2):#设置加密次数
    m = ''
    for i in range(len(a)):
        if (ord(a[i])>=65 and ord(a[i])<=87) or(ord(a[i])>=97 and ord(a[i])<=119):
            m+=chr(ord(a[i])+3)
        elif (ord(a[i])>=88 and ord(a[i])<=90) or(ord(a[i])>=120 and ord(a[i])<=122):
            m+=chr(ord(a[i])-23)
        else:
            m+=a[i]
    a = m

print(m)