更新:
将消息附加到当前异常并重新引发它:(外部try / except只是为了显示效果)
对于python 2.x,其中x> = 6:
try:
try:
raise ValueError # something bad...
except ValueError as err:
err.message=err.message+" hello"
raise # re-raise current exception
except ValueError as e:
print(" got error of type "+ str(type(e))+" with message " +e.message)
这也将做正确的事情 自ValueError
。例如UnicodeDecodeError
。
请注意,您可以添加任意内容err
。例如err.problematic_array=[1,2,3]
。
@Ducan在注释中指出以上内容不适用于python 3,因为.message
它不是的成员ValueError
。相反,您可以使用此代码(有效的python 2.6或更高版本或3.x):
try:
try:
raise ValueError
except ValueError as err:
if not err.args:
err.args=('',)
err.args = err.args + ("hello",)
raise
except ValueError as e:
print(" error was "+ str(type(e))+str(e.args))
根据目的,您还可以选择在自己的变量名下添加额外的信息。对于python2和python3:
try:
try:
raise ValueError
except ValueError as err:
err.extra_info = "hello"
raise
except ValueError as e:
print(" error was "+ str(type(e))+str(e))
if 'extra_info' in dir(e):
print e.extra_info