Question 13 Level 2
Question: Write a program that accepts a sentence and calculate the number of letters and digits. Suppose the following input is supplied to the program: hello world! 123 Then, the output should be: LETTERS 10 DIGITS 3
Hints: In case of input data being supplied to the question, it should be assumed to be a console input.
方法一
str = input("请输入字符串内容：") dig,let = 0,0 for i in str: if i.isdigit(): dig += 1 if i.isalpha(): let += 1 print("LETTERS %d"%let) print("DIGITS %d"%dig)方法二-字典
dic = {'LETTERS':0,'DIGITS':0} str = input("请输入字符串：") for i in str: if i.isalpha(): dic['LETTERS'] += 1 if i.isdigit(): dic['DIGITS'] += 1 print("LETTERS %d"%dic['LETTERS']) print("LETTERS %d"%dic['DIGITS'])Question 14 Level 2
Question: Write a program that accepts a sentence and calculate the number of upper case letters and lower case letters. Suppose the following input is supplied to the program: Hello world! Then, the output should be: UPPER CASE 1 LOWER CASE 9
Hints: In case of input data being supplied to the question, it should be assumed to be a console input.
dic = {"UPPER CASE":0,"LOWER CASE":0} str = input("请输入字符串：") for s in str: if s.isupper(): dic['UPPER CASE'] += 1 if s.islower(): dic['LOWER CASE'] += 1 print("UPPER CASE %d"%dic['UPPER CASE']) print("LOWER CASE %d"%dic['LOWER CASE'])Question 15 Level 2
Question: Write a program that computes the value of a+aa+aaa+aaaa with a given digit as the value of a. Suppose the following input is supplied to the program: 9 Then, the output should be: 11106
Hints: In case of input data being supplied to the question, it should be assumed to be a console input. 方法一
i = int(input("请输入数值‘0-9’：")) r = i+(i*10+i)+(i*100+i*10+i)+(i*1000+i*100+i*10+i) print(r)方法二
i = int(input("请输入数值‘0-9’：")) n1 = int("%d"%i) n2 = int("%d%d"%(i,i)) n3 = int("%d%d%d"%(i,i,i)) n4 = int("%d%d%d%d"%(i,i,i,i)) print(n1+n2+n3+n4)Question 16 Level 2
Question: Use a list comprehension to square each odd number in a list. The list is input by a sequence of comma-separated numbers. Suppose the following input is supplied to the program: 1,2,3,4,5,6,7,8,9 Then, the output should be: 1,3,5,7,9
Hints: In case of input data being supplied to the question, it should be assumed to be a console input.
list = input("请输入数值，以','分割：").split(',') for i in list: if int(i)%2 == 0: list.remove(i) print(",".join(list))Question 17 Level 2
Question: Write a program that computes the net amount of a bank account based a transaction log from console input. The transaction log format is shown as following: D 100 W 200
D means deposit while W means withdrawal. Suppose the following input is supplied to the program: D 300 D 300 W 200 D 100 Then, the output should be: 500
Hints: In case of input data being supplied to the question, it should be assumed to be a console input.
total = 0 while True: s = input("请输入数值，以D/W进行前置标识，以空格做分割：").split(" ") count = s[1].strip() if s[0].upper() == "D": if int(count) > 0: total += int(count) print(total) else: print("输入的值必须大于0") if s[0].upper() == "W": if int(count) > 0 : total -= int(count) print(total) else: print("输入有误")Question 18 Level 3
Question: A website requires the users to input username and password to register. Write a program to check the validity of password input by users. Following are the criteria for checking the password:
At least 1 letter between [a-z]At least 1 number between [0-9]At least 1 letter between [A-Z]At least 1 character from [$#@]Minimum length of transaction password: 6Maximum length of transaction password: 12 Your program should accept a sequence of comma separated passwords and will check them according to the above criteria. Passwords that match the criteria are to be printed, each separated by a comma. Example If the following passwords are given as input to the program: ABd1234@1,a F1#,2w3E*,2We3345 Then, the output of the program should be: ABd1234@1Hints: In case of input data being supplied to the question, it should be assumed to be a console input.
name = input("请输入账号信息：") p = input("请输入密码信息，以逗号分割:").split(',') def check_pwd(p): for pwd in p: up_count, low_count, num_count, ts_count = 0, 0, 0, 0 if len(pwd) in range(6, 13): for i in pwd: if str(i).isupper(): up_count += 1 elif str(i).islower(): low_count += 1 elif str(i).isdigit(): num_count += 1 elif str(i) in ("$#@"): ts_count += 1 else: pass if (up_count > 0) and (low_count > 0) and (num_count > 0) and (ts_count > 0): print(pwd) else: print("密码必须取6-12位，包含字母大小写、特殊符号、数字") check_pwd(p)Question 19 Level 3
Question: You are required to write a program to sort the (name, age, score) tuples by ascending order where name is string, age and score are numbers. The tuples are input by console. The sort criteria is: 1: Sort based on name; 2: Then sort based on age; 3: Then sort by score. The priority is that name > age > score. If the following tuples are given as input to the program: Tom,19,80 John,20,90 Jony,17,91 Jony,17,93 Json,21,85 Then, the output of the program should be: [(‘John’, ‘20’, ‘90’), (‘Jony’, ‘17’, ‘91’), (‘Jony’, ‘17’, ‘93’), (‘Json’, ‘21’, ‘85’), (‘Tom’, ‘19’, ‘80’)]
Hints: In case of input data being supplied to the question, it should be assumed to be a console input. We use itemgetter to enable multiple sort keys.
import operator l = [] while True: s = input() if not s: break l.append(tuple(s.split(","))) print(sorted(l, key=operator.itemgetter(0,1,2)) )Question 20 Level 3
Question: Define a class with a generator which can iterate the numbers, which are divisible by 7, between a given range 0 and n.
Hints: Consider use yield
class Num_7(object): def __init__(self,n): self.min = 0 self.max = n def check_7(self): for i in range(0,self.max): if i%7 == 0 : print(i,end=" ") if __name__ == '__main__': num = Num_7(89) num.check_7()