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Python daily practice - day 1: daffodils

編輯：Python

1. Problem description

Narcissus number is also called super perfect number invariant 、 Narcissistic number 、 Self idempotent 、 Armstrong number or Armstrong number , The number of Narcissus refers to a 3 digit , Of the numbers in each of its bits 3 The sum of the powers is equal to itself . 1、 The Narcissus count is a three digit number ：111 333 456 999 5302、 The number of daffodils 、 ten 、 The sum of the hundreds of digit cubes is equal to the original number After the partners read the problem description , Be sure to practice yourself first , Then go to see the blogger's code and problem-solving ideas , In order to improve their programming level , It all depends on self-consciousness ！！！

2. Problem analysis

 How to get a bit 、 ten 、 The number in the hundreds ?  Single digit 37==1== ： It's the original number pair 10 The result of the remainder operation 37==1== % 10 = ==1== 
 Ten digits 3==7==1：3==7==1 By dividing by 10, Can be 7 Move to a position （ Integers ）：3==7==1 // 10 = 3==7==3==7==：3==7== Yes 10 Take the remainder to get the value of the last digit ==7== ：3==7== % 10 = ==7== 
 Hundreds of digits ==3==71：==3== Is the original number divided by 100 Result （ to be divisible by ）：==3==71 // 100 = ==3== 
 reflection ： How to find the value at the specified position of any number ？1234==5==6789： First 10000 obtain 1234==5==; Right again 10 Get surplus ==5==

3. Algorithm ideas

1. Use cycle from 100 Start to 999 end 2. Every time the circulation inside the body , Get a hundred digit number 、 Ten digit number 、 Single digit numbers 3. Judge whether the third power of a hundred digit number plus the third power of a ten digit number plus the third power of a single digit number is equal to itself , If so, it is the number of daffodils .

4. Code implementation

for Loop code implementation

Implementation code ：

print('100 To 1000 The number of all daffodils before is as follows ：')
for i in range(100, 1000):
 #  Take a hundred  371 // 100 = 3
 x = i // 100
 #  Take the tens  371 // 10 =3 7; 37 % 10 = 7
 y = i // 10 % 10
 #  Take a single  371 % 10 = 1
 z = i % 10
 #  Judge the position 、 ten 、 The sum of the hundreds of digit cubes is equal to the original number 
 if x ** 3 + y ** 3 + z ** 3 == i:
 print(f'{i} It's Narcissus ')

Running results ：

while Loop code implementation

Implementation code ：

print('100 To 1000 The number of all daffodils before is as follows ：')
number = 100
while number < 1000:
 #  Take a hundred  371 // 100 = 3
 x = number // 100
 #  Take the tens  371 // 10 =3 7; 37 % 10 = 7
 y = number // 10 % 10
 #  Take a single  371 % 10 = 1
 z = number % 10
 #  Judge the position 、 ten 、 The sum of the hundreds of digit cubes is equal to the original number 
 if x ** 3 + y ** 3 + z ** 3 == number:
 print(f'{number} It's Narcissus ')
 #  Need to set up number Add one... At a time 
 number += 1

Running results ：

5. How to make question brushing more efficient ？

1. Programming white contestant Many novice programmers have learned basic grammar , But I don't know the purpose of grammar , I don't know how to deepen the image , I don't know how to improve myself , This is the time It's very important to brush one question independently every day （ Refining into a God ）, You can go to the introductory training of programming beginners on Niuke online . This topic is at the entry level of programming , Suitable for Xiaobai who has just learned grammar , The topic involves basic grammar of programming , Basic structure, etc , Each question has practice mode and examination mode , The test mode can be restored for simulation , You can also practice through practice mode . Link address ： Cattle from | Beginner programming training 2. Advanced programming player When you have gradually mastered the key points of knowledge after basic practice , Go to this time Learn data structures in special exercises 、 Algorithm basis 、 Fundamentals of computer etc. . Start with the simple , If you feel up, do it in medium difficulty , And more difficult topics . These three are the knowledge points that must be tested in the interview , We can only insist on practicing more every day by ourselves , Refuse to lie flat and continue to brush questions , Continuously improve yourself to impact a satisfactory company . Link address ： Cattle from | Special exercises  Speed up , Let's attack the big factory together , If you have questions, leave a message in the comment area to answer ！！！