How to communicate between modules in Python

How to communicate between modules in Python

In Python, communication between modules is a very common requirement. Communication between modules can help us split and decouple functions, making code processing clearer and more flexible. This article will introduce several common methods of inter-module communication in Python and give specific code examples.

1. Global variables
   Using global variables is a simple method of inter-module communication. In Python, you can define global variables in one module and then reference this global variable in other modules. Here is an example:

# module1.py

global_variable = "Hello, World!"

# module2.py

from module1 import global_variable

print(global_variable)  # 输出：Hello, World!

2. Function parameters
   Passing data to other modules through function parameters is also a common communication method. Two modules can call each other's functions to pass data. Here is an example:

# module1.py

def func1(data):
    return data * 2

# module2.py

from module1 import func1

result = func1(5)

print(result)  # 输出：10

3. Import module
   In Python, a module can import another module, thereby obtaining all the variables and functions of that module. This way you can easily call the functions of other modules. The following is an example:

# module1.py

def func1(data):
    return data * 2

# module2.py

import module1

result = module1.func1(5)

print(result)  # 输出：10

4. Queue (Queue)
   Asynchronous communication between modules can be achieved using the queue data structure. Python provides the queue module, which makes it easy to create and use queues. The following is an example:

# module1.py

import queue

q = queue.Queue()

def func1():
    while True:
        data = q.get()
        print("Received:", data)

# module2.py

import module1

module1.q.put("Hello")
module1.q.put("World")

In the above code, module2.py passes to the queue q in module1.py Putting in data enables communication between the two modules.

Summary:
In Python, communication between modules can use methods such as global variables, function parameters, imported modules, and queues. Depending on specific needs, choosing the appropriate communication method can improve code readability and flexibility. I hope the code examples provided in this article will help you understand and use communication between modules.

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