What are the common process control structures in Python?

There are three common process control structures in python, namely sequence structure, selection structure and loop structure. Detailed introduction: 1. Sequential structure, which is the simplest structure in the program. According to the order of the code, it is executed from top to bottom; 2. Selection structure, this structure can be judged according to certain conditions and choose to execute different codes. Blocks, in Python, usually use "if-elif-else" statements to implement selection structures; 3. Loop structures, which can repeatedly execute a piece of code until it stops when a certain condition is met, etc.

The operating system for this tutorial: Windows 10 system, Python version 3.11.4, DELL G3 computer.

The common process control structures in Python are as follows:

1. Sequential structure: This is the simplest structure in the program. According to the order of the code, from Execute in sequence from top to bottom.

2. Selection structure: This structure can select and execute different code blocks based on certain conditions. In Python, we usually use if-elif-else statements to implement selection structures.

3. Loop structure: The loop structure can repeatedly execute a piece of code until it stops when a certain condition is met. Python provides two loop structures: for loop and while loop.

The following is a detailed description of these control structures:

1. Sequential structure: The sequential structure is a simple process control structure that executes in the order of the code. . In Python, we only need to execute it line by line in the order of the code.

Example:

print("这是第一行代码")  
print("这是第二行代码")  
print("这是第三行代码")

2. Selection structure: The selection structure can select and execute different code blocks based on certain conditions. In Python, we usually use if-elif-else statements to implement selection structures.

Example:

num = 10  
if num > 0:  
    print("这个数是正数")  
elif num < 0:  
    print("这个数是负数")  
else:  
    print("这个数是零")

3. Loop structure: The loop structure can repeatedly execute a piece of code until it stops when a certain condition is met. Python provides two loop structures: for loop and while loop.

for loop: for loop is usually used to traverse a sequence (list, tuple, string) or other iterable object.

Example:

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

while loop: while loop will repeatedly execute a piece of code until it stops when a certain condition is met. If the condition is not met in the first place, the code within the loop will not be executed even once.

Example:

i = 0  
while i < 5:  
    print(i)  
    i += 1

The above are the common process control structures in Python. These structures are the basis of programming, and they allow programs to perform complex operations as we wish.

The above is the detailed content of What are the common process control structures in Python?. For more information, please follow other related articles on the PHP Chinese website!