例子1
try:
#test area
function()
except Exception, e:
print e.message
例子2：用raise抛出一个异常
if bool_var is not True:
raise Exception #other statements
#...... expect Exception:
do_something()
例子3：输出异常到log
import traceback
import logging except Exception as e:
print(e)
logging.error("Error: \n%s" % traceback.format_exc())
#OR logging.error(e) #log format:
#ERROR: xxx
一、try/expect
try:
#...
expect: ##
#...
finally:
#...
可以没有如果有，则一定会被执行。 finally语句；finally
捕捉一个异常：
expect IOError:
print(...)
多个expect语句，会按顺序检测错误类型：
try:
print('try...')
r = 10 / int('a')
print('result:', r)
except ValueError as e:
print('ValueError:', e)
except ZeroDivisionError as e:
print('ZeroDivisionError:', e)
finally:
print('finally...')
print('END')
用一个块捕捉多个异常：
except (ZeroDivisionError, NameError, TypeError):
print('Errors!')
全捕捉：
try:
##
expect:
print('Error!')
try/expect - else:子句
如果没有错误发生，可以在except语句块后面加一个else，当没有错误发生时，会自动执行else语句：
try:
print('try...')
r = 10 / int('2')
print('result:', r)
except ValueError as e:
print('ValueError:', e)
except ZeroDivisionError as e:
print('ZeroDivisionError:', e)
else:
print('no error!')
finally:
print('finally...')
print('END')