Python核心第二版习题答案-.pdf

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1、Pytho 核心编程第二版（第二，三，四，五章）答案第二章2-3 a=int(input(A=)b=int(input(B=)print(A-B=%d,A+B=%dnA/B=%d,A*B=%d,A%B=%d%(a-b,a+b,a/b,a*b,a%b)2-4（a）print(input(Enter a string:)（b）print(int(input(Enter a value:)2-5（a）i=0 whilei11:print(i)i+=1（b）fori in range(11):print(i)2-6 v=int(input(Enter a number to determine pos

2、itive or negative:)if v0:print(%d is negative%v)elif v=0:print(you enter zero)else:print(%d is positive%v)2-7 while 循环s=input(Enter a string：)i=0 whileilen(s):print(si)i+=1 for 循环s=input(Enter a string:)fori in s:print(i)2-8 while 循环print(Enter five number)v=i=0 s=0 whilei5:a=input(n%d=%(i+1)v.exten

3、d(int(a)s=s+vi i+=1 print(v)print(sum=%d%s)for 循环print(Enter five number)v=s=0 fori in range(5):a=input(n%d=%(i+1)v.extend(int(a)s=s+vi print(v)print(sum=%d%s)2-9 print(Enter five number)v=s=0 fori in range(5):a=input(n%d=%(i+1)v.extend(int(a)s=s+vi print(v)print(ave=%f%(float(s)/len(v)2-10 i=1 whil

4、e i:n=int(input(Enter a number between 1-100:)if n=1:print(Done)i=0 else:print(Error)2-11 while True:s=0 c=int(input(1sum,2ave,0exit:n)if c=1:fori in range(5):n=int(input(n%d=%(i+1)s+=n print(s)if c=2:fori in range(5):n=int(input(n%d=%(i+1)s+=n print(float(s/5)if c=0:break 2-15 a=int(input(a=)b=int(

5、input(b=)c=int(input(c=)n=if ab:a,b=b,a if ac:a,c=c,a if bc:b,c=c,b n.extend(a,b,c)print(n)第三章;importos ls=os.linesep def write():while True:fname=input(Enter file name:)ifos.path.exists(fname):print(Error%s already exists%fname)else:break all=print(nEnter lines(.by itself to quit).n)while True:entr

6、y=input()if entry=.:break else:all.append(entry)fobj=open(fname,w)fobj.writelines(%s%s%(x,ls)for x in all)fobj.close()print(Done)def read():while True:fname=input(Enter filename:)if not os.path.exists(fname):print(sorry,%s is not exists%fname)else:break try:fobj=open(fname,r)exceptIOError as e:print

7、(*file open error,e)else:foreachline in fobj:print(eachline),fobj.close()i=0 whilei!=q:i=input(rread,w,write,qquite:)ifi=r:read()elifi=w:write()第四，五章4-1python 对象的三个属性，身份，类型，值（ID,type，value）除了值之外其他两个都是只读的如果对象支持更新操作，那么他的值就是可改变的，否也是只读的5-2defmul(a,b):m=a*b return(m)x=int(input(x=)y=int(input(y=)print(mu

8、l(x,y)5-3def grade(a):if a100 or a=90:print(A)elif a=80:print(B)elif a=70:print(C)elif a=60:print(D)else:print(F)while True:x=int(input(Enter your score:)if x=0:break else:grade(x)5-4defly(y):if(y%100!=0 and y%4=0)or y%400=0:print(%d is leap year%y)else:print(%d is not leap year%y)while True:x=int(i

9、nput(Enter the year:)if x=0:break else:ly(x)5-5def cd(m0):if m01:print(Error,请输入 0 到 1 之间的金额)else:m=m0*100 a=m/25 a1=m%25 b=a1/10 b1=a1%10 c=b1/5 c1=b1%5 d=c1 print(%f美元=25 美分 x%d+10美分 x%d+5美分 x%d+1美分 x%d%(m0,a,b,c,d)while True:m0=float(input(请输入金额：)if m0=0:break else:cd(m0)5-6while True:s=input(请输入

10、要计算的式子:n)if s=0:break else:ifs.find(*)!=-1:ls=s.split(*)print(float(ls0)*float(ls1)elifs.find(+)!=-1:ls=s.split(+)print(float(ls0)+float(ls1)elifs.find()!=-1:ls=s.split()print(float(ls0)*float(ls1)elifs.find(/)!=-1:ls=s.split(/)print(float(ls0)/float(ls1)elifs.find(%)!=-1:ls=s.split(%)print(float(ls

11、0)%float(ls1)5-8import math defsqcu():a=float(input(输入正方形或立方体的边长：)print(边长为,a,的正方形面积是,round(a*a,3)print(边长为,a,立方体体积是,a*3)defcisp():r=float(input(输入圆或球的半径：)print(半径为,r,的圆面积是,round(math.pi*(r*2),3)print(半径为,r,的球的体积是,round(math.pi*(r*3)*4/3,3)sqcu()cisp()5-10defFtoC():f=float(input(输入华氏温度：)c=(f-32)*(5/

12、9)print(f,华氏度等于,round(c,3),摄氏温度)FtoC()5-11defevod():e=o=fori in range(21):if i%2=0:e.append(i)else:o.append(i)print(偶数:,e,n 奇数:,o)defjudiv():a,b=int(input(enter the first number:),int(input(enter the second number:)ifa%b=0:print(a,能被,b,整除)else:print(a,不能被,b,整除)evod()judiv()5-13defhmtom():hm=input(输入

13、时间(格式 hh:mm):)lhm=hm.split(:)m=float(lhm0)*60+float(lhm1)print(m)hmtom()5-15defgcd():a,b=int(input(a=),int(input(b=)t1,t2=a,b while b!=0:if a=p:s=s-p n=n+1 print(n,p,round(s,2)print(n,round(s,2),p)while True:payment()5-17import random l=i=0 N=random.randint(2,100)whileiN:n=random.randint(0,2*31)l.append(n)i+=1 print(l)print(n)for x in range(len(l):for y in range(x,len(l):if lxly:ly,lx=lx,ly print(l)