try: #正常代码逻辑 ins = raw_input("this is a tast:") print ins+1 except Exception,e: print e
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try: # 正常代码逻辑 ins = raw_input("this is a tast:") print ins + 1 except IndexError, e: #只有遇到IndexError 才捕获 print e
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try: # 正常代码逻辑 ins = raw_input("this is a tast:") print ins + 1 except IndexError, e: #只有遇到IndexError 我才补货 print e except Exception, e: #捕获所有错误 print e
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>常用的异常
AttributeError 试图访问一个对象没有的树形,比如foo.x,但是foo没有属性x IOError 输入/输出异常;基本上是无法打开文件 ImportError 无法引入模块或包;基本上是路径问题或名称错误 IndentationError 语法错误(的子类) ;代码没有正确对齐 IndexError 下标索引超出序列边界,比如当x只有三个元素,却试图访问x[5] KeyError 试图访问字典里不存在的键 KeyboardInterrupt Ctrl+C被按下 NameError 使用一个还未被赋予对象的变量 SyntaxError Python代码非法,代码不能编译(个人认为这是语法错误,写错了) TypeError 传入对象类型与要求的不符合 UnboundLocalError 试图访问一个还未被设置的局部变量,基本上是由于另有一个同名的全局变量, 导致你以为正在访问它 ValueError 传入一个调用者不期望的值,即使值的类型是正确的
所有异常
ArithmeticError AssertionError AttributeError BaseException BufferError BytesWarning DeprecationWarning EnvironmentError EOFError Exception FloatingPointError FutureWarning GeneratorExit ImportError ImportWarning IndentationError IndexError IOError KeyboardInterrupt KeyError LookupError MemoryError NameError NotImplementedError OSError OverflowError PendingDeprecationWarning ReferenceError RuntimeError RuntimeWarning StandardError StopIteration SyntaxError SyntaxWarning SystemError SystemExit TabError TypeError UnboundLocalError UnicodeDecodeError UnicodeEncodeError UnicodeError UnicodeTranslateError UnicodeWarning UserWarning ValueError Warning ZeroDivisionError
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>抛出异常 程序员控制 主动发出的异常
from catgre import f1 try : n = "1" n = int(n) ret = f1() if ret: print "done" else: #print "出现错误" raise Exception("false") except Exception,e: print '出现错误',e
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try: #逻辑代码 pass except IndexError,e: pass except Exception ,e: pass else: #逻辑代码未出现任何错 pass finally: #不管出没出现错误 finally 里的代码永远执行 pass
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