Lesson - 42 : Python3 - Python Exception Handling : Exception, Hierarchy, Handling, Different blocks
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Python Core PlayList : • Lesson - 01 : Python3 - What is python
Python Advanced PlayList : • Lesson - 46 : Python Advanced - Pytho...
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Python Exception Handling : What is an exception:
Exception handling enables you handle errors gracefully and do something meaningful about it. Like display a message to user if intended file not found. Python handles exception using try.. except .. block.
Syntax :
try:
write some code
that might throw exception
except ＜ExceptionType＞:
Exception handler, alert the user
As you can see in try block you need to write code that might throw an exception. When exception occurs code in the try block is skipped. If there exist a matching exception type inexcept clause then it’s handler is executed.
try:
f = open('somefile.txt', 'r')
print(f.read())
f.close()
except IOError:
print('file not found')
Python Exception Handling : How to handle the exception:
Exception handling enables you handle errors gracefully and do something meaningful about it. Like display a message to user if intended file not found. Python handles exception using try.. except .. block.
As you can see in try block you need to write code that might throw an exception. When exception occurs code in the try block is skipped. If there exist a matching exception type inexcept clause then it’s handler is executed.
try:
f = open('somefile.txt', 'r')
print(f.read())
f.close()
except IOError:
print('file not found')
1. First statement between try and except block are executed.
2. If no exception occurs then code under except clause will be skipped.
3. If file don’t exists then exception will be raised and the rest of the code in the try block will be skipped
4. When exceptions occurs, if the exception type matches exception name after except keyword, then the code in that except clause is executed.
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