Python Errors Explained: Usage & Handling

In Python, an error refers to an exception or mistake that occurs during the program’s execution. It is a special type of object that can be used to catch and handle exceptions that occur in the program.

Generally, the error object can be accessed by catching exceptions. Exception handling can be done using a try-except statement block. The code within the try block is monitored, and if an exception occurs, the control flow will jump to the corresponding except block where the exception can be handled or other actions can be taken.

Here is an example demonstrating how to use try-except to handle exceptions.

try:
    # 可能会引发异常的代码
    result = 10 / 0
except ZeroDivisionError as e:
    # 处理ZeroDivisionError异常
    print("除以0错误：", e)
except Exception as e:
    # 处理其他类型的异常
    print("发生了未知错误：", e)

In the example above, if the division operation raises a ZeroDivisionError exception, the program will jump to the first except block and print out the corresponding error message. If a different type of exception occurs, the program will jump to the second except block and print out the corresponding error message.

In addition to using try-except statements to catch exceptions, you can also use the raise keyword to manually raise exceptions. By creating a custom error class, you can define your own exception type and raise it when needed.

In summary, the usage of error in Python is to capture and handle exceptional situations that may occur in a program, in order to ensure the program can run smoothly or take appropriate actions for resolution.