Example Analysis of Python catching exception

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Exceptions in 1.python

Syntax error: the program is not written according to the grammar rules

Run error: run time error

Logic error: logic error

An exception object (exception object) is used to represent an exception

two。 Catch exception try-except

Exception with a divisor of 0:

Put the detected statement block into the try block and the exception handling statement block into the except block

If there is no exception in the detected statement block, the exception handling after except is ignored; otherwise, the exception handling statement block is executed.

Multiple except clauses

One except block catches multiple exceptions

Empty except: catches all exceptions

As statement:

Put the cause of the error in the err variable and print the variable

Else statement:

If there are no exceptions in the try block, the else statement is executed

If you want to type multiple times after an exception is generated until it is correct, you can add while True and break statements

The location of the break statement

Jump out of the loop if input is normal

Finally clause

Finally statements can be used in try statements, and the statement blocks in the finally clause are executed regardless of whether an exception occurs or not

Context Manager and with statements

The with statement assigns the value of the context management expression to the variable and executes its statement sequence

With automatically closes files after completion, which is the recommended usage for manipulating objects such as files and databases in python.

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