Python核心第二版习题答案.pdfVIP

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=%d\nA/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 positive 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(s[i]) 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.extend([int(a)]) s=s+v[i] 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+v[i] 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+v[i] print(v) print(ave=%f % (float(s)/len(v))) 2-10 i=1 while i: n=int(input(Enter a number between 1-100:)) if n=100 and 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(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: f