The difference between python exception error warnings

Error and exception concepts

Error:

1. Syntax error: the code does not comply with the interpreter or Compiler syntax

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

Exception: Thousands of objects 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 must be modified before execution. Logic errors cannot be modified.

Exceptions are divided into two steps:

1. Exception generation, an error is detected and the interpreter considers it an exception, and an exception is thrown;

2. Exception handling, intercepting exceptions, ignoring or terminating the program to handle exceptions

Common Python errors

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 Handle

try:
    try_suite
except Exception [， e]:
    exception_block

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