python核心編程第七章習題答案(3)

7–10.   加密

def rot13(info):    infolist=[]    for c in info:        if c.isalpha():            cnum=ord(c)            if (65<=cnum<78) or (97<=cnum<110):                infolist.append(chr(cnum+13))            else:                infolist.append(chr(cnum-13))        else:            infolist.append(c)    return ''.join(infolist)def input_info():    return raw_input("Enter string to rot13:")

7–13.   隨機數

# Filename:test7-13.pyimport randomdef createset():    s=set()    m=random.randint(1,11)    for i in range(m):        s.add(random.randint(0,10))    print s    return sA=set(createset())B=set(createset())print A|B,A&B