挑战Python100题(2)

100+ Python challenging programming exercises 2

Question 11

Question: Write a program which accepts a sequence of comma separated 4 digit binary numbers as its input and then check whether they are divisible by 5 or not. The numbers that are divisible by 5 are to be printed in a comma separated sequence.

Example: 0100,0011,1010,1001 Then the output should be: 1010

Notes: Assume the data is input by console.

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

问题：编写一个接受逗号分隔的4位二进制数字序列作为输入的程序，然后检查它们是否可以被5整除。可被5整除的数字将以逗号分隔的顺序打印。

示例：0100001110101001那么输出应该是：1010

注意：假设数据是通过控制台输入的。

提示：在向问题提供输入数据的情况下，应该假设它是控制台输入。

Solution:

value = []
items=[x for x in input().split(',')]
for p in items:
? ? intp = int(p, 2)
? ? if not intp%5:
? ? ? ? value.append(p)

print(','.join(value))

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Question 12

Question: Write a program, which will find all such numbers between 1000 and 3000 (both included) such that each digit of the number is an even number. The numbers obtained should be printed in a comma-separated sequence on a single line.

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

Solution:

values = []
for i in range(1000, 3001):
? ? s = str(i)
? ? if (int(s[0])%2==0) and (int(s[1])%2==0) and (int(s[2])%2==0) and (int(s[3])%2==0):
? ? ? ? values.append(s)
print(",".join(values))

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Question 13

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.

Solution:

s = input()
d={"DIGITS":0, "LETTERS":0}
for c in s:
? ? if c.isdigit():
? ? ? ? d["DIGITS"]+=1
? ? elif c.isalpha():
? ? ? ? d["LETTERS"]+=1
? ? else:
? ? ? ? pass
print("LETTERS", d["LETTERS"])
print("DIGITS", d["DIGITS"])

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Question 14

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.

Solution:

s = input()
d={"UPPER CASE":0, "LOWER CASE":0}
for c in s:
? ? if c.isupper():
? ? ? ? d["UPPER CASE"]+=1
? ? elif c.islower():
? ? ? ? d["LOWER CASE"]+=1
? ? else:
? ? ? ? pass
print("UPPER CASE", d["UPPER CASE"])
print("LOWER CASE", d["LOWER CASE"])

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Question 15

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.

Solution:

a = input()
n1 = int( "%s" % a )
n2 = int( "%s%s" % (a,a) )
n3 = int( "%s%s%s" % (a,a,a) )
n4 = int( "%s%s%s%s" % (a,a,a,a) )
print(n1+n2+n3+n4)

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Question 16

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.

Solution:

values = input()
numbers = [x for x in values.split(",") if int(x)%2!=0]
print(",".join(numbers))

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Question 17

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.

Solution:

netAmount = 0
while True:
? ? s = input()
? ? if not s:
? ? ? ? break
? ? values = s.split(" ")
? ? operation = values[0]
? ? amount = int(values[1])
? ? if operation=="D":
? ? ? ? netAmount+=amount
? ? elif operation=="W":
? ? ? ? netAmount-=amount
? ? else:
? ? ? ? pass
print(netAmount)

?

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Question 18

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: 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.

Solutions:

import re
value = []
items=[x for x in input().split(',')]
for p in items:
? ? if len(p)<6 or len(p)>12:
? ? ? ? continue
? ? else:
? ? ? ? pass
? ? if not re.search("[a-z]",p):
? ? ? ? continue
? ? elif not re.search("[0-9]",p):
? ? ? ? continue
? ? elif not re.search("[A-Z]",p):
? ? ? ? continue
? ? elif not re.search("[$#@]",p):
? ? ? ? continue
? ? elif re.search("\s",p):
? ? ? ? continue
? ? else:
? ? ? ? pass
? ? value.append(p)
print(",".join(value))

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Question 19

Question: You are required to write a program to sort the (name, age, height) tuples by ascending order where name is string, age and height 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.

Solutions: from operator import itemgetter, attrgetter

l = []
while True:
? ? s = input()
? ? if not s:
? ? ? ? break
? ? l.append(tuple(s.split(",")))

print(sorted(l, key=itemgetter(0,1,2)))

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Question 20

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

Solution:

def putNumbers(n):
? ? i = 0
? ? while i<n:
? ? ? ? j=i
? ? ? ? i=i+1
? ? ? ? if j%7==0:
? ? ? ? ? ? yield j

for i in reverse(100):
? ? print(i)

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来源：GitHub - 965714601/Python-programming-exercises: 100+ Python challenging programming exercises