傳遞字典鍵作爲變量名在Python中不起作用

-1

>> print(port1) 

2 

>> print(virsh_out1) 

{1: 'tap5be16f98-d3 bridge  qbr5be16f98-d3 virtio  fa:16:3e:0c:70:bf', 2: 'tap1685f051-29 bridge  qbr1685f051-29 virtio  fa:16:3e:b8:63:49', 3: 'tap54de7c68-a4 bridge  qbr54de7c68-a4 virtio  fa:16:3e:f5:c4:7a', 4: 'tap5b857c99-7c bridge  qbr5b857c99-7c virtio  fa:16:3e:a0:64:dc', 5: 'tap7104dac4-6b bridge  qbr7104dac4-6b virtio  fa:16:3e:fd:d3:ab', 6: 'tap0a3f7a0e-60 bridge  qbr0a3f7a0e-60 virtio  fa:16:3e:dd:50:35'} 

>> dir(virsh_out1) 

['__class__', '__cmp__', '__contains__', '__delattr__', '__delitem__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__gt__', '__hash__', '__init__', '__iter__', '__le__', '__len__', '__lt__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__setitem__', '__sizeof__', '__str__', '__subclasshook__', 'clear', 'copy', 'fromkeys', 'get', 'has_key', 'items', 'iteritems', 'iterkeys', 'itervalues', 'keys', 'pop', 'popitem', 'setdefault', 'update', 'values', 'viewitems', 'viewkeys', 'viewvalues'] 

>> print(virsh_out1[2]) 

tap1685f051-29 bridge  qbr1685f051-29 virtio  fa:16:3e:b8:63:49 

>> print(virsh_out1[port1]) 

*** KeyError: '2'

這裏，變量名端口1的值= 2。如果我嘗試使用打印（virsh_out1 [端口1]），它拋出KeyError異常，而同樣的事情與印刷工程（virsh_out1 [2]）。有人可以幫忙嗎？

來源

2017-02-15 user3050091

端口1是一個海峽，但你需要一個int – BlackBear

非常感謝。我將它轉換爲整數並且工作。 – user3050091

將字符串port1爲int，

port1 = '2' 
virsh_out1 = { 1: 'tap5be16f98-d3 bridge  qbr5be16f98-d3 virtio  fa:16:3e:0c:70:bf', 
       2: 'tap1685f051-29 bridge  qbr1685f051-29 virtio  fa:16:3e:b8:63:49', 
       3: 'tap54de7c68-a4 bridge  qbr54de7c68-a4 virtio  fa:16:3e:f5:c4:7a', 
       4: 'tap5b857c99-7c bridge  qbr5b857c99-7c virtio  fa:16:3e:a0:64:dc', 
       5: 'tap7104dac4-6b bridge  qbr7104dac4-6b virtio  fa:16:3e:fd:d3:ab', 
       6: 'tap0a3f7a0e-60 bridge  qbr0a3f7a0e-60 virtio  fa:16:3e:dd:50:35'} 

print(virsh_out1[int(port1)]) 
# tap1685f051-29 bridge  qbr1685f051-29 virtio  fa:16:3e:b8:63:49

來源

2017-02-15 11:40:50 SparkAndShine

傳遞字典鍵作爲變量名在Python中不起作用

回答

相關問題