try-except Statement : Error Exception « Statement « Python Tutorial

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Python Tutorial » Statement » Error Exception 
3. 9. 8. try-except Statement
try:
    f = open('blah', 'r')
except IOError, e:
    print 'could not open file:', e
    
print float(12345)
print float('12345')
print float('123.45e67')

def safe_float(obj):
     try:
         retval = float(obj)
     except ValueError:
          retval = 'could not convert non-number to float'
     return retval

print safe_float('12.34')
print safe_float('bad input')
print safe_float({'a''Dict'})
3. 9. Error Exception
3. 9. 1. Catching Exceptions with try..except
3. 9. 2. ZeroDivisionError: division by any numeric zero
3. 9. 3. IndexError: request for an out-of-range index for sequence
3. 9. 4. KeyError: request for a non-existent dictionary key
3. 9. 5. AssertionError
3. 9. 6. IOError: input/output error
3. 9. 7. AttributeError: attempt to access an unknown object attribute
3. 9. 8. try-except Statement
3. 9. 9. try Statement with Multiple excepts
3. 9. 10. except Statement with Multiple Exceptions
3. 9. 11. replace our single error string with the string representation of the exception argument.
3. 9. 12. Demonstrating a programmer-defined exception class.
3. 9. 13. Exceptions Can Be Classes
3. 9. 14. Exception Classes
3. 9. 15. String-Based Exceptions
3. 9. 16. Working with the Exception Information
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