homework

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#! /usr/bin/env python#coding:utf-8#字符串最后一个单词的长度 put = input("请输入字符串：")put = put.split()print (len(put[-1]))
#计算字符个数
str1 = input("请输入字符串：").upper()char = str1.split()[-1]count = 0str_list = list(str1)for i in str_list:    if i == char:        count += 1print(count)
#3 明文->密文
dir1 = {    "abc":1,    "def":2,    "ghi":3,    "jkl":4,    "mno":5,    "pqr":6,    "stu":7,    "vwx":8,    "yz":9}key_list = dir1.keys()str1 = input("明文：")str2 = ""str_list = list(str1)for i in str_list:    if i.isalpha() :        if i.isupper() :            if i == 'Z':                str2 += 'a'            else:                str2 += chr(ord(i.lower())+1)                continue        else:            for j in key_list:                if i in j :                    str2 += str(dir1[j])                    break    if i.isdigit():        str2 += i        continueprint(str2)


#4 给定一个正整数，编写程序计算有多少对质数的和等于输入的这个正整数，并输出结果。输
入值小于1000。
num = int(input("请输入数字："))a = []
count = 0for i in range(2,1000):    for j in range(2,1000):        if (i % j == 0) or i < j:            break        else:            a.append(i)            breakprint(a)for i in a:    if i > num/2 :        break    for j in a:        if i+j == num:            print("(%d,%d)" % (i , j))
    count += 1
print (count)

5、ATM 
教室的电脑上忘记拷贝了
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