Python Power, Simplified: A Beginner-Friendly Approach to Programming

Introduction to Python Programming Installation of Python: Download and install from the official website. Hello World!: Use print("Hello World!") to print the first line of code. Practical case: Calculate the area of ​​a circle: Use π (3.14159) and the radius to calculate the area of ​​a circle. Variables and data types: Use variables to store data. Data types in Python include integers, floating point numbers, strings, and Boolean values. Expressions and assignments: Use operators to connect variables, constants, and functions, and use the assignment operator (=) to assign values ​​to variables. Control flow: if-else statement: execute different code blocks based on conditions, determine the oddity

Python – Easy entry into programming, a concise method for beginners

Python is a widely used programming language known for its readability, clear syntax, and extensive libraries to help you solve various programming challenges. For beginners, mastering Python is an ideal way to start programming.

Install Python

• Go to the official Python website https://www.python.org/ to download and install Python.
• Verify installation: Enter python --version in the command line and it will display the installed Python version.

Hello World! Your first Python program

print("Hello World!")

This line of code will print "Hello World!" to the console, allowing you to Learn the basics of Python.

Practical Example: Calculating the Area of ​​a Circle

Python is good at mathematical calculations, which makes it suitable for a variety of scientific and engineering applications. Here is a Python program to calculate the area of ​​a circle:

pi = 3.14159
radius = float(input("输入半径："))
area = pi * radius ** 2
print("圆面积为：", area)

Execute the program:

1. Create or paste the code in a Python interpreter or IDE.
2. Enter the radius value (as a floating point number).
3. Run the program using Python.

Variables and Data Types

Python uses variables to store data. A variable is a container with a name and a value. Python’s data types include:

• Integer (int)
• Float (float)
• String (str)
• Boolean ( bool)

For example:

name = "约翰"  # 字符串变量
age = 25  # 整数变量
salary = 1000.0  # 浮点数变量
is_student = True  # 布尔值变量

Expressions and assignments

Expressions are variables and constants connected by operators or function. The assignment operator (=) is used to assign the value of an expression to a variable. For example:

result = 5 + 3  # 表达式
total = result * 2  # 赋值

Operator

Python supports various operators, including:

• Arithmetic operators (, -, *, /, %)
• Comparison operators (==, !=, <, >, <=, >=)
• Logical operators (and, or, not)

Control flow: if-else statement

if-else statement is used to execute different blocks of code based on conditions. The syntax is as follows:

if condition:
    # 如果条件为真，执行此代码块
else:
    # 如果条件为假，执行此代码块

Practical Case: Determining Odd and Even Numbers

number = int(input("输入一个数字："))
if number % 2 == 0:
    print("此数为偶数")
else:
    print("此数为奇数")

Follow these steps, you will gradually delve into the magical world of Python and unleash its power Function.

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