Learn Python programming from scratch: master these codes and get started easily

Introduction to Python Programming: Master these codes and get started easily

Introduction:
Python, as a simple and easy-to-learn high-level programming language, is widely used in various Fields such as data analysis, artificial intelligence, web crawlers, etc. Learning Python programming is the first choice for many people because it has easy-to-read and understandable syntax and rich library support. This article aims to help beginners quickly get started with Python programming, explaining it through specific code examples.

1. Basic syntax

1. Print output:

print("Hello, World!")

2. Variable assignment:

name = "Alice"
age = 20

3. Conditional statement:

if age >= 18:
    print("成年人")
else:
    print("未成年人")

4. Loop statement:

for i in range(5):
    print(i)

2. Data type and data structure

1. List (List) ：

fruits = ["apple", "orange", "banana"]
print(fruits[0])  # 输出：apple
fruits.append("grape")  # 添加元素

2. Dictionary：

person = {"name": "Bob", "age": 25, "gender": "male"}
print(person["age"])  # 输出：25
person["city"] = "New York"  # 添加键值对

3. Tuple：

point = (3, 4)
x, y = point

4. String operation:

s = "Hello, World!"
print(s[0])  # 输出：H
print(len(s))  # 输出：13
print(s.lower())  # 输出：hello, world!

3. Functions and modules

1. Function definition and call:

def add(x, y):
    return x + y

result = add(3, 4)
print(result)  # 输出：7

2. Module reference and usage:

import math

print(math.sqrt(16))  # 输出：4.0

4. File operations

1. Open and read files:

file = open("example.txt", "r")
contents = file.read()
print(contents)
file.close()

2. Write files ：

file = open("example.txt", "w")
file.write("Hello, World!")
file.close()

5. Exception handling

try:
    result = 10 / 0
except ZeroDivisionError:
    print("除数不能为零")

Conclusion:
This article introduces the basic syntax of Python programming, commonly used data types and data structures, the use of functions and modules, File operations and exception handling. These are essential knowledge for getting started with Python programming. By mastering these code examples, I believe you can easily get started with Python programming and use its powerful functions in practical applications. Keep learning and practicing, and you will continue to grow and progress in the world of Python!

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