浙大版PTA《Python 程序设计》题目集 参考答案

浙大版PTA《Python 程序设计》题目集 参考答案

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PTA浙大版《Python 程序设计》题目集 详解教程_少侠PSY的博客-CSDN博客

01第1章-1 从键盘输入两个数，求它们的和并输出

a=int(input()) # 输入a的值 b=int(input()) # 输入b的值 print(a+b)     # 输出a+b的值 

02第1章-2 从键盘输入三个数到a,b,c中，按公式值输出

a,b,c=input().split() a=int(a) b=int(b) c=int(c) print(b*b-4*a*c) 

03第1章-3 输出“人生苦短，我学Python”

print("人生苦短，我学Python") 

04第2章-1 计算 11+12+13+…+m

m=int(input())  s=sum([i for i in range(11,m+1)]) print("sum =",s) 

05第2章-2 计算分段函数[1]

x = float(input()) if x != 0:     y = 1 / x else:     y = 0 print("f({:.1f}) = {:.1f}".format(x, y)) 

06第2章-3 阶梯电价

e = float(input()) cost = 0  if e < 0:     print("Invalid Value!") else:     if e <= 50.00:         cost = e * 0.53     else:         cost = 50.0 * 0.53 + (e - 50) * (0.53 + 0.05)     print(f"cost = {cost:.2f}") 

07第2章-4 特殊a串数列求和

a, n = map(int, input().split()) tn = 0 sn = 0  for i in range(1, n + 1):     tn = tn * 10 + a #第n项的值     sn = sn + tn     #前n项的和  print("s =", sn) 

08第2章-5 求奇数分之一序列前N项和

N = int(input()) s = 0  for i in range(N):     s += 1 / (i + i + 1)  print(f"sum = {s:.6f}") 

09第2章-6 求交错序列前N项和

n = int(input()) sum = 0 sign = 1  for i in range(1, n + 1):     sum += sign * i / (i + i - 1)     sign *= -1  print(f"{sum:.3f}") 

10第2章-7 产生每位数字相同的n位数

a,b=input().split(',') print(int(str(int(a))*int(b))) 

11第2章-8 转换函数使用

x,y=eval(input()) # x,y=map(int, input().split(',')) print(int(str(x),y))  

12第2章-9 比较大小

a, b, c = map(int, input().split())  if b > c:     b, c = c, b  if a > b:     a, b = b, a  if b > c:     b, c = c, b  print(f"{a}->{b}->{c}") 

13第2章-10 输出华氏-摄氏温度转换表

lower, upper = map(int, input().split()) if lower > upper:     print("Invalid.") else:     print("fahr celsius")     while lower <= upper:         celsius = 5 * (lower - 32) / 9         print(f"{lower:d}{celsius:6.1f}")         lower += 2 

14第2章-11 求平方与倒数序列的部分和

m, n = map(int, input().split()) res = 0  for i in range(m, n + 1):     res += i * i + 1 / i  print(f"sum = {res:.6f}") 

15第2章-12 输出三角形面积和周长

import math  a, b, c = map(int, input().split())  if a + b > c and b + c > a and a + c > b:     perimeter = a + b + c     s = (a + b + c) / 2.0     area = math.sqrt(s * (s - a) * (s - b) * (s - c))     print(f"area = {area:.2f}; perimeter = {perimeter:.2f}") else:     print("These sides do not correspond to a valid triangle") 

16第2章-13 分段计算居民水费

x = float(input()) if x > 15.0:     print("{:.2f}".format(2.5 * x - 17.5)) else:     print("{:.2f}".format(4 * x / 3)) 

17第2章-14 求整数段和

A, B = map(int, input().split()) s = c = 0  for i in range(A, B + 1):     print(f'{i:5d}', end='')     c += 1     if c == 5:         print()         c = 0     s += i  if c:     print() print(f'Sum = {s}') 

18第3章-1 大于身高的平均值

l=input().split() l1=[int(i) for i in l] aver=sum(l1)/len(l1) l2=[i for i in l1 if i>aver] for i in l2:    print(i,end=' ') 

19第3章-2 查验身份证

#自定义函数，用于验证一个身份证号码是否合法。 def validate_id_number(s):     w = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2]     m = "10X98765432"     sum = 0     for j in range(17):         if not s[j].isdigit():             return False         sum += int(s[j]) * w[j]     sum = sum % 11     if s[17] != m[sum]:         return False     return True  # 主程序 n = int(input()) cnt = 0  for i in range(n):     s = input()     if len(s) != 18 or not validate_id_number(s):         cnt += 1         print(s)  if cnt == 0:     print("All passed") 

20第3章-3 输出字母在字符串中位置索引

sen=input() a,b=input().split() lst=[(i,sen[i]) for i in range(len(sen)) if sen[i]==a or sen[i]==b] lstnew=lst[::-1] for i in range(len(lstnew)):     print(lstnew[i][0],lstnew[i][1]) 

21第3章-4 查找指定字符

cc = input() str = input()  index = -1 for i in range(len(str)):     if str[i] == cc:         index = i  if index != -1:     print(f"index = {index}") else:     print("Not Found") 

22第3章-5 字符转换

s = input() n = 0  for char in s:     if '0' <= char <= '9':         n = n * 10 + int(char)  print(n) 

23第3章-6 求整数序列中出现次数最多的数

a = input().split() element_count = {}   if a:     a.pop(0)  for element in a:     element_count[element] = a.count(element)  max_element = max(element_count, key=element_count.get)  max_count = element_count[max_element]   print(max_element, max_count)  

24第3章-7 求最大值及其下标

n=int(input()) a=list(map(int,input().split())) print(max(a),a.index(max(a))) 

25第3章-8 字符串逆序

s = input() s = s[::-1] print(s) 

26第3章-9 字符串转换成十进制整数

s = input() hex_str = ""  negative = False   for c in s:     if c.isdigit() or c.upper() in "ABCDEF":         hex_str += c     elif c == "-" and len(hex_str) == 0:         negative = True if hex_str:     num = int(hex_str, 16)     if negative:         num = -num     print(num) else:     print(0) 

27第3章-10 统计大写辅音字母

a = input() cnt=0 for n in a :    if n.isupper() and n!="A" and n!="E" and n!="I" and n!="O" and n!="U":       cnt=cnt+1 print(cnt) 

28第3章-11 字符串排序

lst = input().split() lst.sort() print("After sorted:") for i in range(0,len(lst)):     print(lst[i]) 

29第3章-12 求整数的位数及各位数字之和

n=input() l=[int(i) for i in n] print(len(n),sum(l)) 

30第3章-13 字符串替换

a = list(input()) m = [chr(i) for i in range(ord('A'),ord('Z')+1)] for i in range(len(a)):     if a[i] in m:         b=m.index(a[i])         a[i]=m[25-b] b="".join(a) print(b) 

31第3章-14 字符串字母大小写转换

str = input() for i in str:     if i == "#":       break           elif i.islower():         print(i.upper(),end = "")     elif i.isupper():         print(i.lower(),end = "")     else:         print(i,end = "") 

32第3章-15 统计一行文本的单词个数

cnt=0 for i in input().split():     cnt+=1 print(cnt) 

33第3章-16 删除重复字符

a=set(input()) lst=list(a) lst.sort() print(f"{''.join(lst)}") 

34第3章-17 删除字符

str=input() c=input() str,c=str.strip(),c.strip()#移除字符串两端的空白字符 result=str.replace(c.upper(),"")#将 c 的大写形式删除 result=result.replace(c.lower(),"")#将 c 的小写形式删除 print("result:",result) 

35第3章-18 输出10个不重复的英文字母

s = input().strip() li = [] for i in s:     if i.isalpha() and i.upper() not in li and i.lower() not in li :         li.append(i)         if len(li)==10:             break if len(li)<10:     print('not found') else:     s = ''.join(li)     print(s) 

36第3章-19 找最长的字符串

n = int(input()) max = 0 for i in range(n):     s = input()     if(max<len(s)):         max=len(s)         maxstr=s print('The longest is:',maxstr) 

37第3章-20 逆序的三位数

s=input() s=s[::-1] print(int(s)) 

38第3章-21 判断回文字符串

s=input() print(s) if s==s[::-1]:     print('Yes') else:     print('No') 

39第3章-22 输出大写英文字母

s = input() t="" flag=0 for element in s:     if(element.isupper()):         t=t+element         flag=1 if(flag==0):     print("Not Found") else:     lst=list(t)     res=list(set(lst))     res.sort(key=lst.index)     print("".join(res)) 

40第4章-1 生成3的乘方表

n=int(input()) for i in range(n+1):     a = 3**i     print(f"pow(3,{i}) = {a}") 

41第4章-2 统计素数并求和

import math  def is_prime(num):     sqrt_num = int(math.sqrt(num))     if num == 1:         return False     for i in range(2, sqrt_num + 1):         if num % i == 0:             return False     return True  m, n = map(int, input().split()) counts = 0 sum = 0 for i in range(m, n+1):     if is_prime(i):         counts += 1         sum += i print(f"{counts} {sum}") 

42第4章-3 猴子吃桃问题

N=int(input()) def show(N):     x=1     for i in range(0,N-1):         x=(x+1)*2     return x print(show(N)) 

43第4章-4 验证“哥德巴赫猜想”

import math  def isPrime(num):     sqrt_num = int(math.sqrt(num))     if num == 1:         return False     for i in range(2, sqrt_num + 1):         if num % i == 0:             return False     return True  x=int(input()) for y in range(2,x//2+1):     z = x - y     if (isPrime(y) == 1 and isPrime(z) == 1):         print('{:d} = {:d} + {:d}'.format(x, y, z))         break 

44第4章-5 求e的近似值

from math import factorial total = 1 n = int(input()) for i in range(n):     total += 1/factorial(i+1) print(f'{total:.8f}') 

45第4章-6 输出前 n 个Fibonacci数

n=int(input()) a, b = 0, 1 if(n>0):     for i in range(n):         print(f'{b:11d}',end="")         a, b = b, a + b         if((i+1)%5==0):             print() else:     print("Invalid.") 

46第4章-7 统计学生平均成绩与及格人数

n=int(input()) if(n==0):     print('average = 0.0')     print('count = 0') else:     lst = list(map(int,input().split()))     sum = sum(lst)     aver=sum/n     new_lst = [x for x in lst if x >= 60]     cnt = len(new_lst)     print(f'average = {aver:.1f}')     print(f'count = {cnt:d}') 

47第4章-8 求分数序列前N项和

N=int(input()) a,b,c=2,1,0 for i in range(N):     c+=a/b     a,b=a+b,a print(f"{c:.2f}") 

48第4章-9 查询水果价格

print("[1] apple\n[2] pear\n[3] orange\n[4] grape\n[0] exit") num=list(map(int,input().split())) price=[3,2.5,4.1,10.2] for i in range(len(num)):     if num[i]==0 or i>=5:         break     elif num[i]>0 and num[i]<5:         print("price = %.2f"%price[num[i]-1])     else:         print("price = 0.00") 

49第4章-10 最大公约数和最小公倍数

import math a,b=map(int,input().split()) print(math.gcd(a,b),int((a*b)/math.gcd(a,b))) 

50第4章-11 判断素数

def prime(n):     if n < 2:         return False     for i in range(2, int(n**0.5)+1):         if n % i == 0:             return False     return True  n = int(input()) for i in range(n):     num = eval(input())     print('Yes') if prime(num) else print('No') 

51第4章-12 求满足条件的斐波那契数

n = int(input("请输入一个整数："))  fibonacci_sequence = [1, 1]  while fibonacci_sequence[-1] < n:     next_fib = fibonacci_sequence[-1] + fibonacci_sequence[-2]     fibonacci_sequence.append(next_fib)  print("最后一个小于", n, "的斐波那契数是:", fibonacci_sequence[-1]) 

52第4章-13 求误差小于输入值的e的近似值

a=float(input()) b,c=2,1 n,count=2,1 while b-c>=a:     count*=n     n+=1     c=b     b=b+1/count print(f"{b:.6f}") 

53第4章-14 统计字符

input_string = input() letter_count, blank_count, digit_count, other_count = 0, 0, 0, 0  while len(input_string) < 10:     input_string += '\n'  # 行尾回车符补上     input_string += input()  input_string = input_string[:10]  for char in input_string:     if char.isalpha():         letter_count += 1     elif char.isspace():         blank_count += 1     elif char.isdigit():         digit_count += 1     else:         other_count += 1  print('letter = {}, blank = {}, digit = {}, other = {}'.format(letter_count, blank_count, digit_count, other_count)) 

54第4章-15 换硬币

money = int(input()) count = 0 #记录满足条件的组合方式的数量 total = 0 #计算当前组合方式的硬币总数 for fen5 in range(money // 5, 0, -1):     for fen2 in range((money - fen5 * 5) // 2, 0, -1):         fen1 = money - fen5 * 5 - fen2 * 2         total = fen5 + fen2 + fen1         if fen1 > 0:             print(f"fen5:{fen5}, fen2:{fen2}, fen1:{fen1}, total:{total}")             count += 1             total = 0 print(f"count = {count}") 

55第4章-16 jmu-python-判断是否构成三角形

a,b,c=map(int,input().split()) if a+b>c and a+c>b and b+c>a and a>0 and b>0 and c>0:   print('yes') else:   print('no') 

56第4章-17 水仙花数

n = int(input()) for i in range(10**(n-1), 10**n):    #遍历     ls = [int(x)**n for x in str(i)] #计算每个数字的n次方     if sum(ls) == i:                 #每个位上的数字求和，然后与数本身进行比较         print(i) 

57第4章-18 猴子选大王

n=int(input()) a=[i for i in range(1,n+1)] index=0 while len(a)>1:     x=a.pop(0)     index+=1     if index==3:         index=0     else:         a.append(x) print(a[0]) 

58第4章-19 矩阵运算

n = int(input()) total = 0 matrix = []  for i in range(n):     row = list(map(int, input().split()))     matrix.append(row)  for i in range(n):     for j in range(n):         if i + j != n - 1 and j != n - 1 and i != n - 1:             total += matrix[i][j]  print(total) 

59第4章-20 求矩阵各行元素之和

m,n=map(int,input().split()) for i in range(m):     sr=list(map(int,input().split()))     print(sum(sr)) 

60第4章-21 判断上三角矩阵

T = int(input())   for _ in range(T):      n = int(input())       matrix = []      for i in range(n):         row = list(map(int, input().split()))         matrix.append(row)      upper_triangle = True        for i in range(n):           for j in range(n):             if i > j and matrix[i][j] != 0:                   upper_triangle = False                  break      if upper_triangle:          print("YES")     else:         print("NO") 

61第4章-22 找鞍点

num = int(input()) matrix = []  for i in range(num):     matrix.append(list(map(int, input().split()))) for i in range(num):     max_row = max(matrix[i][k] for k in range(num))     for j in range(num):         min_col = min(matrix[k][j] for k in range(num))         if max_row == min_col:             print(f"{i} {j}")             exit() print("NONE") 

62第4章-23 求矩阵的局部极大值

m,n=map(int,input().split()) ls=[] count=0 for i in range(m):     s=input()     ls.append([int(i) for i in s.split()]) for i in range(1,m-1):     for j in range(1,n-1):         if ls[i][j]>ls[i-1][j] and ls[i][j]>ls[i+1][j] and ls[i][j]>ls[i][j-1] and ls[i][j]>ls[i][j+1]:             print(ls[i][j],i+1,j+1)             count+=1 if count==0:     print("None",m,n) 

63第4章-24 打印九九口诀表

n=int(input()) for i in range(1,n+1):     for j in range(1,i+1):         print("%d*%d=%-4d"%(j,i,i*j),end='')     print() 

64第4章-25 输出三角形字符阵列

n=int(input()) s=ord("A") for i in range(n,0,-1):     for j in range(i):         print(chr(s),end=' ')         s +=1     print() 

65第4章-26 求1!+3!+5!+……+n!

n = int(input()) total_sum = 1 factorial = 1  for odd_number in range(3, n + 1, 2):     factorial *= odd_number*(odd_number-1)     total_sum += factorial  print(f"n={n},s={total_sum}") 

66第4章-27 二维数组中每行最大值和每行和

ls=list(map(int,input().split())) s=[] for j in range(3):     s=ls[3*j:(j+1)*3]     for i in range(3):         print("{:>4d}".format(s[i]),end='')     print(f"{max(s):>4d}",end='')     print(f"{sum(s):>4d}") 

67第4章-28 矩阵转置第4章-28 矩阵转置

ls=list(map(int,input().split())) s=[] for i in range(3):     s.append(ls[3*i:(i+1)*3]) for i in range(3):     for j in range(3):         print(f"{s[j][i]:>4d}",end='')     print() 

68第4章-29 找出不是两个数组共有的元素

l1=list(map(str,input().split())) l2=list(map(str,input().split())) ls=[] l1.pop(0) l2.pop(0) for i in l1:     if i not in l2 and i not in ls:         ls.append(i) for j in l2:     if j not in l1 and j not in ls:         ls.append(j) print(*ls) 

69第4章-30 找完数

flag = 0 m,n = map(int,input().split()) for i in range (m,n+1):     s = [1]      for j in range (2,int(i**0.5 + 1)):         if i%j ==0:             s.append(j)             s.append(i//j)     if sum(s) == i:         s.sort()         print (i,end=" = ")         print(' + '.join(map(str,s)))         flag=1 if(flag == 0):     print("None") 

70第5章-1 输出星期名缩写

a=input() sum={'1':'Mon','2':'Tue','3':'Wed','4':'Thu','5':'Fri','6':'Sat','7':'Sun'} print(sum[a]) 

71第5章-2 图的字典表示

n=int(input()) vertex=0 edge=0 length=0 for i in range(n):     l=input()     d=eval(l)     for key1 in d:         vertex+=1         for key2 in d[key1]:             edge+=1             length+=d[key1][key2] print(vertex,edge,length) 

72第5章-3 四则运算（用字典实现）

result={"+":"x+y","-":"x-y","*":"x*y","/":'x/y if y!=0   \         else "divided by zero"'} x=int(input()) z=input() y=int(input()) r=eval(result.get(z)) if type(r)!=str:  print(f'{r:.2f}')  else:  print(r) 

73第5章-4 分析活动投票情况

s={"6","7","8","9","10"}-set(input().split(",")) lst=list(s) lst=[int(i) for i in lst] lst.sort() print(*lst) 

74第5章-5 统计字符出现次数

s=input() ch=input() dc={} for c in s:     dc[c]=dc.get(c,0)+1 if ch in s:     print(dc[ch]) else:     print(0) 

75第5章-6 统计工龄

N = int(input()) dic = {} ls = list(map(int,input().split())) for i in ls:     if i not in dic:         dic[i] = 1     else:         dic[i]+=1 for i in sorted(dic.keys()):     print(f"{i}:{dic[i]}") 

76第5章-7 列表去重

lst=eval(input()) seen=set() lst1=[i for i in lst if i not in seen and not seen.add(i)] print(*lst1) 

77第5章-8 能被3,5和7整除的数的个数（用集合实现）

a,b=input().split() a,b=int(a),int(b) s1=set([i for i in range(a,b+1) if i%3==0]) s2=set([i for i in range(a,b+1) if i%5==0]) s3=set([i for i in range(a,b+1) if i%7==0]) print(len(s1&s2&s3)) 

78第5章-9 求矩阵鞍点的个数

n=int(input()) a=[] for i in range(0,n):     b=input().split()     a.insert(i,b) c=[] d=[] for i in range(0,n):     maxa=max(int(a[i][j]) for j in range(n))     mina=min(int(a[k][i]) for k in range(0,n))     c+=[(i,j) for j in range(n) if int(a[i][j])==maxa]     d+=[(k,i) for k in range(n) if int(a[k][i])==mina] c=list(set(c)&set(d)) print(len(c)) 

79第5章-10 两数之和

nums = list(map(int,input().split(','))) target = int(input())  hm = dict() for i in range(len(nums)):     if nums[i] in hm:         print(hm[nums[i]], i)         break     hm[target - nums[i]] = i else:     print("no answer") 

80第5章-11 字典合并

#合并字典 dic1=eval(input()) dic2=eval(input()) dic3={} keys=set(dic1.keys())|set(dic2.keys()) for key in keys:     value=dic1.get(key,0)+dic2.get(key,0)     dic3[key]=value #排序 lst=[(ord(k) if k not in range(0,10) else k,v) for k,v in dic3.items()] lst.sort() #输出 lst1=[] for t in lst:     if 0<=t[0]<=9:         lst1.append("{}:{}".format(t[0],t[1]))     else:         lst1.append('"{}":{}'.format(chr(t[0]),t[1])) print("{"+",".join(lst1)+"}") 

81第6章-1 输入列表，求列表元素和(eval输入应用）

lst=eval(input()) s=sum([i for i in lst])  print(s) 

82第6章-2 一帮一

N = int(input()) male_students = []  # 存储男生信息的列表 female_students = []  # 存储女生信息的列表 count = 1  while N > 0:     s = list(input().split())     if int(s[0]) == 1:         male_students.append([s[1], count])         count+=1     else:         female_students.append([s[1], count])         count += 1     N -= 1  while male_students and female_students:     if male_students[0][1] < female_students[0][1]:         print(f"{male_students.pop(0)[0]} {female_students.pop()[0]}")     else:         print(f"{female_students.pop(0)[0]} {male_students.pop()[0]}") 

83第6章-3 列表或元组的数字元素求和

def sum_nested_numbers(data):     total = 0     for item in data:         if isinstance(item, (int, float)):             total += item         elif isinstance(item, (list, tuple)):             total += sum_nested_numbers(item)     return total  input_data = eval(input())  # 从输入字符串中解析出列表或元组 result = sum_nested_numbers(input_data) print(result) 

84第6章-4 列表数字元素加权和(1)

def calculate_weighted_sum(lst, depth=1):     total = 0     for item in lst:         if isinstance(item, list):             total += calculate_weighted_sum(item, depth + 1)         else:             total += item * depth     return total  input_list = eval(input()) result = calculate_weighted_sum(input_list) print(result) 

85第6章-5 列表元素个数的加权和(1)

def weighted_element_count(lst, depth=1):     count = 0     for item in lst:         if isinstance(item, list):             count += weighted_element_count(item, depth + 1)         else:             count += depth     return count  input_str = input() input_list = eval(input_str)  result = weighted_element_count(input_list)  print(result) 

86第6章-6 求指定层的元素个数

def count_integers_at_depth(X, depth):     cnt = 0     for x in X:         if type(x)==int:             if depth == n:                 cnt += 1         else:             cnt += count_integers_at_depth(x, depth + 1)     return cnt  X = eval(input()) n = int(input()) print(count_integers_at_depth(X, 1)) 

87第6章-7 找出总分最高的学生

num_students = int(input()) student_info = {} max_total_score = -1  for i in range(num_students):     info = input().split()     student_id = info[0]     student_name = info[1]     scores = list(map(int, info[2:]))     total_score = sum(scores)      if total_score > max_total_score:         max_total_score = total_score         top_student = (student_name, student_id, total_score)  print("{} {} {}".format(top_student[0], top_student[1], top_student[2])) 

88第6章-8 输出全排列

import itertools  n = int(input()) numbers = list(range(1, n + 1)) permutations = list(itertools.permutations(numbers))  for perm in permutations:     print("".join(map(str, perm))) 

89 第6章函数-1

def fn(a, n):     result = 0     current_term = 0      for i in range(1, n + 1):         current_term = current_term * 10 + a         result += current_term      return result 

90第6章函数-2 使用函数求素数和

# 定义一个函数 prime，用于判断一个数是否为素数 def prime(p):     if p <= 1:         return False     for i in range(2, int(p**0.5) + 1):         if p % i == 0:             return False     return True  # 定义函数 PrimeSum，用于返回区间 [m, n] 内所有素数的和 def PrimeSum(m, n):     prime_sum = 0     for num in range(m, n + 1):         if prime(num):             prime_sum += num     return prime_sum 

91第6章函数-3 使用函数统计指定数字的个数

def CountDigit(number,digit ):      numlist=list(str(number))      dig=str(digit)      count=numlist.count(dig)      return count 

92第6章函数-4 使用函数输出指定范围内Fibonacci数的个数

def fib(n):     if n==0:         return 1     elif n==1:         return 1      else:         i=2;a=1;b=1         while i<=n:              a,b = b,a+b              i=i+1         return b  def PrintFN(m,n):      fiblist=[]      a=1;b=1      while a<=n:          if a>=m:             fiblist.append(a)          a,b=b,a+b      return fiblist 

93第6章函数-5 使用函数求余弦函数的近似值

import math def funcos(eps,x):     i=0;s=0;flag=1     while True:        item=x**i/math.factorial(i)        if abs(item)>=eps:                s=s+flag*item                flag=-flag                i=i+2        else:            break     return s 

94第6章函数-6 缩写词

def  acronym(phrase):         words=phrase.split()         res=""         for word in words:              res=res+word[0].upper()         return res 

95第7章-1 词频统计

import re, collections, sys  words = "".join([line for line in sys.stdin]) words = re.compile(r"\w+", re.I).findall(words.lower().split('#')[0]) words = [each.strip() for each in words] words = list(map(lambda each: each[0:15] if len(each) > 15 else each, words)) counter = collections.Counter(words) rank = sorted(counter.items(), key=lambda each: (-each[1], each[0]), reverse=False) print(len(rank)) for each in rank[0:int(0.1*len(rank))]:     print("{}:{}".format(each[1], each[0]))