The difference between exceptions and errors in python

Error and exception concepts

Error:

1. Syntax error: The code does not conform to the interpreter or compiler syntax

2. Logic error: Incomplete or illegal input or calculation problem

Exception: Thousands of entities occur during execution, causing the program to fail to execute

1. The program encounters logic or algorithm problems

2. Computer error during operation (insufficient memory or IO error)

The difference between errors and exceptions

Error:

Syntax or logic errors before the code is run ,

Syntax errors are modified before execution, logical errors cannot be modified

Exceptions are divided into two steps:

1.Exception is generated, the error is detected and the interpreter thinks it is Exception, throw an exception;

2. Exception handling, intercept the exception, ignore or terminate the program to handle the exception

Common errors in Python

Common errors: under ipython

1. a : NameError

Direct reference when a variable is not defined

2. if True : SyntaxError

Syntax error

3. f = open('1.txt') : IOError

When trying to open a file that does not exist

4. 10/0 : ZeroDivisionError

5. a = int('dd') : ValueError

Error encountered when performing forced type conversion

try-except: exception handling

try:
    try_suite
except Exception [， e]:
    exception_block

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