Use Python exception handling to Display error messages

Python exception handling has powerful processing capabilities. The error information is displayed to the customer. in Python exception handling, you can operate on it, the following is a detailed introduction to Python exception handling. Python has powerful exception handling capabilities and can accurately report error information to users.

1. Use try and try t statements to capture exceptions

 
 

  
  
try:  
  
  
   block  
  
  
except [exception,[data…]]:  
  
  
   block  
  
  
 
  
  
try:  
  
  
block  
  
  
except [exception,[data...]]:  
  
  
   block  
  
  
else:  
  
  
   block  
  
  
 
  
  
 
  
  
try:  
  
  
 
  
  
   f = open(“file.txt”,”r”)  
  
  
except IOError, e:  
  
  
   print e  
  
  
 
 
 

Python exception handling has powerful processing capabilities. The error information is displayed to the customer. in Python exception handling, you can operate on it, the following is a detailed introduction to Python exception handling.

Python has powerful exception handling capabilities and can accurately report error information to users.

2. Use try and try t statements to capture exceptions

 
 

  
  
try:  
  
  
   block  
  
  
except [exception,[data…]]:  
  
  
   block  
  
  
 
  
  
try:  
  
  
block  
  
  
except [exception,[data...]]:  
  
  
   block  
  
  
else:  
  
  
   block  
  
  
 
 
 

The detailed cause of the captured IOError will be placed in Object e, and then the mongot code block that runs this python exception handling will capture all the exceptions.

3. Manually raise an exception using the raise statement:

 
 

  
  
Raise [exception [, data]
  
  
 
  
  
Try:
  
  
Raise MyError # throw an exception
  
  
Failed t MyError:
  
  
Print 'a error'
  
  
 
  
  
Raise ValueError, 'invalid argument'
  
  
 
  
  
 
  
  
 
 
 

4. Use the sys module to trace the final exception

 
 

  
  
import sys  
  
  
try:  
  
  
   block  
  
  
except:  
  
  
   info=sys.exc_info()  
  
  
   print info[0],":",info[1]  
  
  
 
  
  
 
  
  
 
 
 

5. other usage of python exception handling

The following example demonstrates how to use exceptions to support specific platform functions. The Code comes from the getpass module, a encapsulation module that obtains the password from the user. The implementation of the obtained password on UNIX, Windows, and Mac OS platforms is different, but this Code encapsulates all the differences.

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