Python进阶挑战：100道实战题提升逻辑与库应用

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"《100个Python编程题》是一本旨在通过实践提升Python技能的书籍，共包含100个不同难度级别的编程挑战，适合初学者、中级和高级学习者逐步进阶。书中将问题分为三个等级： 1. 入门级（Level 1 - Beginner）：针对刚接触Python的学员，他们可能完成了基础课程，能够使用1到2个Python类或函数解决简单问题。例如，第一个问题要求编写一个程序，找出2000到3200之间能被7整除但不是5的倍数的所有数字，并以逗号分隔的形式打印出来。这类题目旨在熟悉基本语法和条件语句。 2. 中级级（Level 2 - Intermediate）：适合有一定Python编程背景但希望进一步提升的学员，他们可以处理涉及3个或更多Python类或函数的问题，答案不会直接给出，需要独立思考和运用已学知识来解决。这级挑战鼓励对数据结构和算法的理解应用。 3. 高级级（Level 3 - Advanced）：对于熟练掌握Python的开发者，题目更加复杂，需要利用丰富的库、函数和高级技术解决问题。参与者需要运用Python标准库以及高级技巧来完成任务，这有助于他们在实际项目中展现出色的编程能力。每道问题都采用模板形式，包括问题提示和解决方案，以便学习者在尝试解答后对比自己的代码，找出不足并进行改进。通过逐级解决这些题目，读者不仅能巩固Python基础知识，还能逐渐提升编程思维和解决问题的能力。这本书是Python学习者进行自我测试和提升的重要参考资料。"

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:

passprint("UPPER CASE", d["UPPER CASE"])print("LOWER CASE", d["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.

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)

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.

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