First of all, my code is a screenshot, you need to tap it if you want to use it.
The reason is not explained, the sturdy life does not need explanation.
experiment one
Question 1. Bring up "The Zen of Python"
1) Practice goals
Learn some important principles to focus on to write beautiful Python programs
2) Thought tips
import this
Question 2. Compute the following mathematical expressions written in a Python program
（1）
（2）
1) Practice goals
Master built-in numerical operators and variable assignment
2) Thought tips
Pay attention to the operator corresponding to the operator symbol
Question 3. The user inputs a four-digit natural number, calculates and outputs the numbers in the thousands, hundreds, tens and ones places
1) Practice goals
Master the features of built-in numeric type converters and input functions
2) Thought tips
Note the difference between division and division
Question 4. Write a script to write your student number, name, age, class and other information into myinf.txt in the following format
Name: Guo Jing
Age: 27
Student ID: D2017001
Class: Class 2
1) Practice goals
Master basic input and output and file operations
2) Thought tips
Use the open function, pay attention to the use of escape characters
Question 5. Enter the lengths of two sides of a triangle and its included angle, find the length of the third side
1) Practice goals
Calling and using the math library
2) Thought tips
Use the cosine law
Convert angles to radians
Experiment 2
Problem 4. Generate a list containing 30 squares of random numbers, ranging from 50 to 100, and then arrange them in ascending order of thousands and output them together with their corresponding random numbers. Such as
[6400, 2500, 8100, …]
2500 50
6400 80
8100 90
1) Practice goals
Application of key and lambda in sorting
2) Thought tips
Use list comprehension, sort(key=lambda....)
Experiment 3
Question 1. Generate 100 random integers, count the frequency of each integer, and arrange them in ascending order of frequency
1) Practice goals
Master the basic operations and properties of dictionaries and the use of sorted
2) Thought tips
Take advantage of random, the get() method of dictionary objects, sorted() and itemgetter()
Problem 2. Input an integer n within 1000 from the keyboard , and factor it, such as
can be output as a list
1) Practice goals
Master the use of while loop
2) Thought tips
Note that the factors are all prime numbers, you can start from 2 to judge whether the prime numbers are divisible by n .
Question 3. Body Mass Index (BMI) is an important standard commonly used internationally to measure the degree of obesity and health of the human body. Its definition is as follows:
The Ministry of Health of my country gives the domestic BMI reference value
| Classification |
BMI value (kg/m²) |
| thin |
<18.5 |
| normal |
18.5-24 |
| fat |
24-28 |
| obesity |
>=28 |
Input height and weight, output the value of BMI and its category.
1) Practice goals
Master the application of multi-branch selection structure
2) Thought tips
if and elif
Question 4. Input two integers from the keyboard and output their greatest common divisor and least common multiple.
1) Practice goals
Use of loop structures
2) Thought tips
The greatest common divisor can be obtained by rolling division, and the least common multiple can be obtained by dividing the product of two numbers by the greatest common divisor.
Experiment 4
Question 1. Format and output the binary, octal, decimal, and hexadecimal expressions of 389 respectively, as well as the corresponding Unicode. Requires width of 30, center alignment, padding with '*'
1) Practice goals
Learn how to format strings
2) Thought tips
Use the {}.format() method
Question 2. Caesar cipher: The Caesar cipher is a method used by Julius Caesar in ancient Rome to encrypt military intelligence. It uses a substitution method to replace each English character in the message with the third character after the character in the alphabet sequence. characters, the corresponding relationship is as follows:
原文：ab c d e f g h i j k l m n o p q r s t u v w x y z
密 文 ： de fghijklmnopqrstuvwxyz abc
For the original character P, the ciphertext character C satisfies the following conditions:
C=（P+3）mod26
Conversely, the decryption method satisfies:
P=（C-3）mod26
Write an encryption algorithm for plaintext
it was the best of times,it was the worst of times, it was the age of wisdom, it was the age offoolishness, it was the epoch of belief, it was the epoch of incredulity
to encrypt.
1) Practice goals
Master the basic operations of strings
2) Thought tips
Use ord() function or maketrans() function and translate() function
Question 3. Enter a paragraph of English, in which there is a separate letter I wrongly written as i, please write a program to correct it
1) Practice goals
Common ways to master strings
2) Thought tips
Use replace() function
Question 4. There is an English text in which a word is repeated 2 times, write a program to check the repeated word and keep one. For example, the text content is "This is is a desk", the program output is "This is a desk".
1) Practice goals
Common ways to master strings
2) Thought tips
Use split() to convert to a list, operate on the list, and then use the join() function to join
Experiment 5
Question 1. Enter a paragraph of English, in which there is a separate letter i wrongly written as I, please write a program to correct it
1) Practice goals
Master regular expression and subpattern syntax
2) Thought tips
use re.sub
Question 2. Given a segment of documents, find all words starting with the letter k or K
1) Practice goals
Master regular expressions and word pattern syntax
2) Thought tips
Use re.complie() method and while loop
Question 3. Write a function that receives two integer parameters m and n, and returns the first number in the Fibonacci sequence greater than m+n
1) Practice goals
Master the definition and calling methods of functions
2) Thought tips
Using a while loop, note the proper way to generate the Fibonacci sequence
Question 4. Goldbach's conjecture: Write a function that receives an even number, outputs two prime numbers, and the sum of the two prime numbers is equal to the original even number, if there are multiple groups, all output.
1) Practice goals
Master the definition and calling methods of functions
2) Thought tips
Two functions can be defined, one to determine whether it is a prime number, and one to decompose
Experiment 6
Question 1. Write a function to determine whether an integer is a prime number, and write the main program to call the function
1) Practice goals
Master the definition and calling of functions
Question 2. Write a function to accept a string, count the number of uppercase letters, lowercase letters, numbers and other characters, and return the result in the form of a tuple
1) Practice goals
Master the definition and calling of functions
Question 3. In a Python program, does a local variable hide the code of a global variable with the same name? verify.
1) Practice goals
Understanding the scope of variables
Question 4. Define a function using a lambda expression that computes the sum of squares of three integers and one parameter defaults to 5.
1) Practice goals
Mastering lambda expressions and default value parameters
Experiment seven
Question 1. Define a circle class Circle, which can calculate the circle product and perimeter according to the radius
1) Practice goals
Master class definitions and properties
Question 2. Write a program, write a student class, and require the attribute of a counter to count how many students have been instantiated in total
1) Practice goals
Master the definition and use of classes
Question 3. Define an operation class for a list, including the methods:
1 list element added
2 Access list elements by index
1) Practice goals
Understand the definition and use of classes
Problem 4. Define a class of students. Has the following class properties:
1 name
2 years old
3 Grades (Chinese, Math, English)
class method:
1 Get the student's name:
2 Get the age of the student
3 Returns the highest score among 3 subjects
Test by instantiating the object
1) Practice goals
Master class definitions and methods
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