How to handle exceptions in python

There are two kinds of errors in python programming, syntax errors and exception handling. Syntax errors occur when there is a problem with the description of the Python program itself and it cannot be parsed into a program. A similar error is NameError, which occurs when the syntax is correct but the name is not defined. Even if there is no problem with the syntax and name, an error occurs during program execution, and that is an exception. In this article, we will introduce exception handling in python in detail.

How to handle exceptions?

To handle exceptions in Python, use try–Chinese. A type of exception can be recorded in a program, and multiple programs can be described. If the exception type is omitted, all exceptions will be caught

To handle exceptions in Python, you can use the try-except syntax. Except, you can describe the type of exception and describe multiple exceptions. If the exception type is omitted, all exceptions are caught.

try:
    // 处理

except [异常]:
    // 异常发生时的处理

else:
    // 不发生异常情况的处理

finally:
    // 必须执行的处理

Let’s look at a specific example

We use try-except syntax to confirm how to handle exceptions. Executed using the Python interpreter. First, let's define a custom function that describes exception handling.

def divide(x, y):
    try:
        result = x / y
    except ZeroDivisionError:
        print("进行了除0的运算！")
    else:
        print("结果：", result, "是答案。")
    finally:
        print("计算结束")

After definition, let’s execute it.

divide(10, 0)

The execution results are as follows. It can be confirmed that the exception through except is caught.

进行了除0的运算！
计算结束

Next, we change the value and execute.

divide(6, 3)

The execution results are as follows. Since no exception occurred this time, the calculation result is displayed by the else clause. Furthermore, in either case, finally execution can be seen.

结果：2是答案
计算结束

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