python基础练习题 有偿

使用内置pow函数，该题可这样解：

with open('encrypted.txt', 'w', encoding='utf-8') as f0:
    en = []
    for x in 'this is a message':
        en.append(chr(pow(ord(x),19,221)))
    enc = ''.join(en)
    f0.write(enc)
with open('encrypted.txt','r',encoding='utf-8') as f,open('decrypted.txt','w',encoding='utf-8') as f1:
    #decrypted:this is a message
    de=[]
    for c in f.read().strip():
        de.append(chr(pow(ord(c),91,221)))
    dec=''.join(de)
    f1.write(dec)
    print(dec)

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