Question 14

写一个程序，接受一个句子，并计算大写字母和小写字母的数量。

假设向程序提供以下输入： Hello world！

然后，输出应为： UPPER CASE 1 LOWER CASE 9

方法1

word = input() upper, lower = 0, 0 for i in word: if 'a' <= i and i <= 'z': lower += 1 if 'A' <= i and i <= 'Z': upper += 1 print("UPPER CASE {0}\nLOWER CASE {1}".format(upper, lower)) 

方法2

word = input() upper, lower = 0, 0 for i in word: lower += i.islower() upper += i.isupper() print("UPPER CASE {0}\nLOWER CASE {1}".format(upper, lower)) 

方法3

word = input() upper = sum(1 for i in word if i.isupper()) # sum function cumulatively sum up 1's if the condition is True lower = sum(1 for i in word if i.islower()) print("UPPER CASE {0}\nLOWER CASE {1}".format(upper, lower)) 

Question 15

写一个程序，计算a+aa+aaa+aaaa的值，其中给定一个数字作为a的值。

假设向程序提供以下输入： 9

然后，输出应为： 11106

方法1

a = input() total, tmp = 0, str() # initialing an integer and empty string for i in range(4): tmp += a # concatenating 'a' to 'tmp' total += int(tmp) # converting string type to integer type print(total) 

方法2

a = input() total = int(a) + int(2*a) + int(3*a) + int(4*a) # N*a=Na, for example a="23", 2*a="2323",3*a="232323" print(total) 

方法3

a = input() print(sum(int(i*a) for i in range(1,5)))