Five basic code examples that Python beginners must know

5 Python code examples that beginners must know

Python is a concise and powerful programming language suitable for beginners to get started. In the process of learning Python, mastering a few basic introductory code examples is very important to establish basic knowledge and improve programming abilities. Below are 5 introductory code examples that beginners must know. Each code example is accompanied by a specific code implementation.

1. Hello, World! - Print a greeting
   As a tradition for entry into programming, the first thing we need to learn is to print a simple greeting. This simple example can help us understand the basic syntax and function calls in Python.

print("Hello, World!")

2. Calculate the sum of two numbers - basic mathematical operations
   We can learn how to perform basic mathematical operations in Python by writing a simple calculator program.

a = 10
b = 5
sum = a + b
print("The sum of", a, "and", b, "is", sum)

3. Determine whether a number is positive, negative or zero - conditional statement
   By determining whether the number entered by the user is positive, negative or zero, we can learn how to use conditional statements in Python Make logical judgments.

num = float(input("请输入一个数: "))
if num > 0:
    print("正数")
elif num == 0:
    print("零")
else:
    print("负数")

4. Loop to print the elements in the list - Loop structure
   By writing a simple program to iterate over the list and print the elements in the list one by one, we can learn how to use the loop structure to Tackle repetitive tasks.

fruits = ["apple", "banana", "cherry"]
for fruit in fruits:
    print(fruit)

5. String Reversal - String Operations
   We can learn how to handle string operations in Python by writing a program to reverse a given string.

str = input("请输入一个字符串: ")
reversed_str = str[::-1]
print("反转后的字符串是:", reversed_str)

By studying the above 5 introductory code examples, beginners can master Python's basic syntax, mathematical operations, conditional statements, loop structures, string operations and other knowledge points. These code examples not only help beginners understand the basic concepts of Python, but also improve their programming skills and problem-solving abilities. I hope that beginners can become masters of Python programming through continuous learning and exploration through practice!

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