python 100題練習記錄（三）

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("請輸入字串內容：")
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("請輸入字串：")
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("請輸入字串：")
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("請輸入數值‘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("請輸入數值‘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("請輸入數值，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("請輸入數值，以D/W進行前置標識，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("輸入的值必須大於0")
    if s[0].upper() == "W":
        if int(count) > 0 :
            total -= int(count)
            print(total)
        else:
            print("輸入有誤")

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:

1. At least 1 letter between [a-z]
2. At least 1 number between [0-9]
3. At least 1 letter between [A-Z]
4. At least 1 character from [$#@]
5. Minimum length of transaction password: 6
6. Maximum 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@1

Hints:
In case of input data being supplied to the question, it should be assumed to be a console input.

name = input("請輸入賬號資訊：")
p = input("請輸入密碼資訊，以逗號分割:").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("密碼必須取6-12位，包含字母大小寫、特殊符號、數字")
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()