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ÀýÈç:
#!/usr/bin/python
# Filename: try_except.py
import sys
try:
s = raw_input('Enter something --> ')
except EOFError:
print '\nWhy did you do an EOF on me?'
sys.exit() # exit the program
except:
print '\nSome error/exception occurred.'
# here, we are not exiting the program
print 'Done'

Êä³öΪ:
$ python try_except.py
Enter something -->
Why did you do an EOF on me?
$ python try_except.py
Enter something --> Python is exceptional!
Done

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Äã¿ÉÒÔʹÓÃraiseÓï¾äÒý·¢Òì³£¡£Ä㻹µÃÖ¸Ã÷´íÎó/Òì³£µÄÃû³ÆºÍ°éËæÒì³£´¥·¢µÄÒì³£¶ÔÏó¡£Äã¿ÉÒÔÒý·¢µÄ´íÎó»òÒì³£Ó¦¸Ã·Ö±ðÊÇÒ»¸öError»òExceptionÀàµÄÖ±½Ó»ò¼ä½Óµ¼³öÀà¡£
ÀýÈç:
#!/usr/bin/python
# Filename: raising.py
class ShortInputException(Exception):
'''A user-defined exception class.'''
def __init__(self, length, atleast):
Exception.__init__(self)
self.length = length
self.atleast = atleast
try:
s = raw_input('Enter something --> ')
if len(s) < 3:
raise ShortInputException(len(s), 3)
# Other work can continue as usual here
except EOFError:
print '\nWhy did you do an EOF on me?'
except ShortInputException, x:
print 'ShortInputException: The input was of length %d, \
was expecting at least %d' % (x.length, x.atleast)
else:
print 'No exception was raised.'

Êä³öΪ:
$ python raising.py
Enter something -->
Why did you do an EOF on me?
$ python raising.py
Enter something --> ab
ShortInputException: The input was of length 2, was expecting at least 3
$ python raising.py
Enter something --> abc
No exception was raised.

Èý.try..finally
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pythonÖлñµÃijÔÂÓжàÉÙÌìµÄº¯Êý

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def dayOfMonth(date):
if date.month == 12:
return 31
else:
return (date.replace(month=date.month+1, day=1) - datetime.timedelta(days=1)).day
......

PythonÄÚ½¨º¯ÊýÖ®——filter,map,reduce

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>>> add ......
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