Python内建异常体系结构
BaseException
+-- SystemExit
+-- KeyboardInterrupt
+-- GeneratorExit
+-- Exception
+-- StopIteration
+-- StandardError
| +-- BufferError
| +-- ArithmeticError
| | +-- FloatingPointError
| | +-- OverflowError
| | +-- ZeroDivisionError
| +-- AssertionError
| +-- AttributeError
| +-- EnvironmentError
| | +-- IOError
| | +-- OSError
| | +-- WindowsError (Windows)
| | +-- VMSError (VMS)
| +-- EOFError
| +-- ImportError
| +-- LookupError
| | +-- IndexError
| | +-- KeyError
| +-- MemoryError
| +-- NameError
| | +-- UnboundLocalError
| +-- ReferenceError
| +-- RuntimeError
| | +-- NotImplementedError
| +-- SyntaxError
| | +-- IndentationError
| | +-- TabError
| +-- SystemError
| +-- TypeError
| +-- ValueError
| +-- UnicodeError
| +-- UnicodeDecodeError
| +-- UnicodeEncodeError
| +-- UnicodeTranslateError
+-- Warning
+-- DeprecationWarning
+-- PendingDeprecationWarning
+-- RuntimeWarning
+-- SyntaxWarning
+-- UserWarning
+-- FutureWarning
+-- ImportWarning
+-- UnicodeWarning
+-- BytesWarning
捕获异常的方式
方法一：捕获所有的异常
''' 捕获异常的第一种方式，捕获所有的异常 '''
try:
a = b
b = c
except Exception,data:
print Exception,":",data
'''输出：＜type 'exceptions.Exception'＞ : local variable 'b'
referenced before assignment ''
方法二：采用traceback模块查看异常，需要导入traceback模块
''' 捕获异常的第二种方式，使用traceback查看异常 '''
try:
a = b
b = c
except:
print traceback.print_exc()
'''输出
其实异常就是不正常，就是不和我们想象一样去执行。它是因为程序出现了错误而在正常控制流以外采取的行为。Python出现异常，就是因为检查了一个错误时，Python解释器无法继续继续执行下去，这时候抛出了异常。往往这个错误分为语法上和逻辑上(不擅长说概念，-_-! )，看看几个例子，总结一下：
1、NameError：尝试访问一个� ......
conn = httplib.HTTPConnection(EPG_IP + ":" + HTTP_PORT)
url = FAV_URL_PARTH +"userid=" + USER_ID + FAV_DIR_MODIFY
param = '''<ps100request id="Favorite.Category.modify">
<categoryid>'''+categoryid+'''</categoryid>
<categoryname>'''+categoryname+'''</ ......
