当我尝试捕获KeyError两次时出现此错误。 python中有什么东西阻止你试图捕获两次相同的错误吗?
$ ./scratch.py
try getting a
can't get a try getting b
Traceback (most recent call last):
File "./scratch.py", line 13, in <module>
print dict['b']
KeyError: 'b'
简化代码如下
dict={}
dict['c'] = '3'
try:
print 'try getting a'
print dict['a']
except KeyError:
print 'can\'t get a try getting b'
print dict['b']
except:
print 'can\'t get a or b'
答案 0 :(得分:2)
我会用一个简单的for循环来做到这一点:
>>> d = {'c': 1}
>>> keys = ['a', 'b', 'c']
>>> for key in keys:
... try:
... value = d[key]
... break
... except KeyError:
... pass
... else:
... raise KeyError('not any of keys in dict')
...
>>> value
1
>>> key
'c'
如果你想在一行中这样做:
key, value = next((k, d[k]) for k in keys if k in d)
答案 1 :(得分:0)
你需要额外的尝试......除了:
dict={}
dict['c'] = '3'
try:
print 'try getting a'
print dict['a']
except KeyError:
print 'can\'t get a try getting b'
try:
print dict['b']
except KeyError as e:
print "Got another exception", e
except:
print 'can\'t get a or b'