A Beginner's Guide to Python Programming – Starting from Scratch

A Guide to Getting Started with Python from Scratch

Python is a simple, easy-to-use and powerful programming language that is very suitable for beginners to get started. This article will provide you with a Python coding guide from scratch, help you understand the basics of Python, and provide specific code examples to help you get started quickly.

1. Installing Python
   First, you need to install Python on your computer. You can visit the official website https://www.python.org/downloads/ to download the latest version of Python and follow the installation wizard to install it.
2. Writing your first Python program
   Now, let’s write your first Python program, open your favorite text editor and enter the following code:

print("Hello, World!")

Save these codes as a file with a .py suffix, such as hello.py. Then, run the file via the command line and you will see the output "Hello, World!" on the console.

3. Variables and data types
   Variables in Python are used to store data. You can assign values ​​to variables directly and change their values ​​as needed. Python supports a variety of data types, including integers, floating point numbers, strings, etc. Here are some basic data type examples:

# 整数
num1 = 10

# 浮点数
num2 = 3.14

# 字符串
name = "John"

# 布尔值
is_true = True
is_false = False

4. Operators
   In Python, you can use various operators to perform arithmetic operations, comparison operations, logical operations, etc. Here are some common operator examples:

# 算术运算符
a = 10
b = 5

print(a + b)  # 加法
print(a - b)  # 减法
print(a * b)  # 乘法
print(a / b)  # 除法
print(a % b)  # 取模运算
print(a ** b) # 幂运算

# 比较运算符
x = 10
y = 5

print(x > y)  # 大于
print(x < y)  # 小于
print(x == y) # 等于
print(x != y) # 不等于

# 逻辑运算符
p = True
q = False

print(p and q)  # 逻辑与
print(p or q)   # 逻辑或
print(not p)    # 逻辑非

5. Conditional Statements
   In Python, you can use conditional statements to execute different blocks of code based on conditions. Here is an example of a conditional statement:

age = 18

if age >= 18:
    print("你已经成年了！")
else:
    print("你还未成年！")

6. Loop
   In Python, you can use loops to repeatedly execute a block of code. The following are two common examples of loop structures:

# for循环
numbers = [1, 2, 3, 4, 5]

for number in numbers:
    print(number)

# while循环
count = 0

while count < 5:
    print(count)
    count += 1

7. Function
   A function is a reusable block of code that encapsulates some operations inside and can be called as needed. Here is a simple function example:

def add_numbers(a, b):
    sum = a + b
    return sum

result = add_numbers(5, 10)
print(result)

Now, you know the basics of Python and have some code examples. Through continuous practice and practice, you can further master Python and use it to develop more interesting and practical applications. I wish you all the best in your Python programming journey!

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