What are the python entry codes?

Python entry code includes: 1. Print statement, which will output the written code on the console; 2. Variables and data types. Variables in Python do not need to be declared and can be assigned directly. Common data types include characters. Strings, integers, floating point numbers, lists, dictionaries; 3. Conditional statements, used to execute different code blocks based on the true or false conditions; 4. Loops, used to repeatedly execute a piece of code. The two common types of loops are for loops and while Loop; 5. Function, a reusable code block; 6. File operation, Python can be used to read and write files.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

Python is a simple and easy-to-learn programming language, suitable for beginners to get started. The following are some common Python introductory code examples:

1, Print statement

This is the simplest Python program for printing output "Hello World".

print("Hello World")

2. Variables and data types

Variables in Python do not need to be declared and can be assigned values ​​directly. The following are examples of some common data types and variable operations:

# 字符串
name = "John"
print("My name is", name)
# 整数
age = 20
print("I am", age, "years old")
# 浮点数
height = 1.75
print("I am", height, "meters tall")
# 列表
fruits = ["apple", "banana", "orange"]
print("My favorite fruit is", fruits[0])
# 字典
person = {"name": "John", "age": 20}
print(person["name"], "is", person["age"], "years old")

3. Conditional statements

Conditional statements are used to execute different code blocks based on the true or false conditions. . The following is an example of a simple conditional statement:

age = 18
if age >= 18:
    print("You are an adult")
else:
    print("You are not an adult yet")

4. Loop

Loop is used to repeatedly execute a piece of code. The following are two common examples of loop structures:

# for循环
fruits = ["apple", "banana", "orange"]
for fruit in fruits:
    print(fruit)
# while循环
count = 0
while count < 5:
    print(count)
    count += 1

5. Function

A function is a reusable block of code. The following is a simple function example:

def greet(name):
    print("Hello", name)
greet("John")

6. File operations

Python can be used to read and write files. The following is an example of reading the contents of a file:

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

The above are some Python introductory code examples, I hope they can help you start learning Python programming.

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