1.python类中不支持函数重载
2.子类总是覆盖父类的方法,甚者参数列表不同也能覆盖
3.捕捉文件IO异常
try:
fsock = open("/notthere")
except IOError:
print "The file does not exist,exiting gracefully"
print "The line will always print"
4.常见异常
#no dictionray key: KeyError
#no list value: ValueError
#no function: AttributeError
#no variable: NameError
#no tran data type: TypeError
#no module: ImportError
5.尝试某种操作,操作某个变量,方法,或导入模块
try:
print tanxiaohai
except NameError:
print "the value does not exist"
else:
print "the value exist"
print "always printf"
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