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Original text from: Front-end Digest: The principle behind the magic of BFC via Melon Space

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In python, you can use the third-party library pyserial to implement multiple serial port calls. The following is a simple sample code: importserial#Set serial port parameters ser1=serial.Serial('COM1',9600)ser2=serial.Serial('COM2',9600)#Send data to serial port 1ser1.write(b'HellofromCOM1' )#Send data to serial port 2ser2.write(b'HellofromCOM2')#Read serial port 1

In python, you can use the input() function to receive user input, including carriage returns. When the user presses the Enter key, the input() function treats the Enter key as part of the input. For example, the following code demonstrates how to receive the user's input (including carriage return) and print it out: user_input=input("Please enter the content:") print("The content you entered is:", user_input) Run this code, Enter a piece of text (including Enter) in the console, and then press the Enter key to see the entered content printed out. Note: In Python2.x version, the input() function will

Analysis of the role and principle of nohup In Unix and Unix-like operating systems, nohup is a commonly used command that is used to run commands in the background. Even if the user exits the current session or closes the terminal window, the command can still continue to be executed. In this article, we will analyze the function and principle of the nohup command in detail. 1. The role of nohup: Running commands in the background: Through the nohup command, we can let long-running commands continue to execute in the background without being affected by the user exiting the terminal session. This needs to be run

KeyError errors in python are usually raised because the specified key does not exist in the dictionary or collection. To resolve a KeyError error, you can follow these steps: Check the source of the error: Look at the key and related lines of code specified in the error message to determine which dictionary, collection, or other data structure caused the error. Confirm that the key exists: Use the in operator or the dict.get() method to check whether the key exists. If the key does not exist, you can take appropriate action, such as using a default value or adding the key to the dictionary. Confirm data type: Check whether the data type of the key is consistent with the data type of the key in the dictionary or collection. If the types do not match, appropriate type conversion can be performed. Use try-exc

In python, you can use the following steps to call encryption functions: Import encryption-related modules, such as hashlib or cryptography. Create an encryption function that accepts the data that needs to be encrypted as a parameter and returns the encrypted result. The specific encryption algorithm and method depend on the encryption module you want to use. Call the encryption function in the main program, pass in the data that needs to be encrypted, and save the encrypted result in a variable. The following is an example, using the sha256 algorithm in the hashlib module for encryption: importashlibdefencrypt(data):#Create a sha256 encryption object encryptor=hash

Regular expressions can be used to determine whether the email format is correct. The following is a simple sample code: functionvalidateEmail($email){//Email regular expression $regex='/^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9 .-]+\.[a-zA-Z]{2,}$/';//Use the preg_match function to match if(preg_match($regex,$email)){returntrue;//The email format is correct}else{ returnfalse;//The email format is incorrect}}//Test $emai

To call the python workflow engine framework, you need to follow the steps below: Install the workflow engine framework: First, you need to install the required workflow engine framework in the Python environment. Common Python workflow engine frameworks include Celery, airflow, Luigi, etc. You can use the pip command to install the required framework, for example: pipinstallcelery Import the workflow engine framework: In the Python script, you need to import the workflow engine framework used. Import the framework into the script using the import statement, for example: importcelery Define workflow tasks: Next, you need to define the workflow tasks. Workflow tasks are

In PHP, you may encounter some errors when using the JSON_encode function to convert an array or object into a jsON string. The following are some common problems and solutions: Error: json_encode()expectsparameter2tobeint,floatgiven Solution: Make sure that when calling the json_encode function, the second parameter options is an integer and not a floating point number. You can use integer constants such as JSON_NUMERIC_CHECK instead of floating point constants. Error: JSON_ERROR_UTF8:MalfORMedUTF-8characters,pos
