加密

fr = open('plainText.txt',mode='r',encoding='utf-8')
plainText = fr.read()
print('明文：'+plainText)
print('密文：',end='')

fw = open('cipherText.txt',mode='a',encoding='utf-8')
for c in plainText :
     print(chr(ord(c)+3),end='')
     fw.write(chr(ord(c)+3))

fr.close()
fw.close()

明文：
密文：＂
Process finished with exit code 0