在Python中，我可以在一个条件中处理两个变量吗？

可以简化这个吗？也许把两者结合起来？告诉我DRY的方法： - \在Python中，我可以在一个条件中处理两个变量吗？

o = old_last_result 
if o == 7: 
    old_last_result_msg = result_7 
elif o == 12: 
    old_last_result_msg = result_12 
elif o == 23: 
    old_last_result_msg = result_23 
elif o == 24: 
    old_last_result_msg = result_24 
elif o == 103: 
    old_last_result_msg = result_103 
elif o == 1000: 
    old_last_result_msg = result_1000 
else: 
    old_last_result_msg = "Error code: #%s" % old_last_result 

n = new_last_result 
if n == 7: 
    new_last_result_msg = result_7 
elif n == 12: 
    new_last_result_msg = result_12 
elif n == 23: 
    new_last_result_msg = result_23 
elif n == 24: 
    new_last_result_msg = result_24 
elif n == 103: 
    new_last_result_msg = result_103 
elif n == 1000: 
    new_last_result_msg = result_1000 
else: 
    new_last_result_msg = "Error code: #%s" % new_last_result

来源

2011-01-29 Flowpoke

result_msgs = { 
    7: result_7, 
    12: result_12, 
    ... 
} 

old_last_result_msg = result_msgs.get(old_last_result, 
    "Error code: #%s" % old_last_result) 
new_last_result_msg = result_msgs.get(new_last_result, 
    "Error code: #%s" % new_last_result)

来源

2011-01-29 00:30:23

甜。刚刚抬起头.get（）http://docs.python.org/library/stdtypes.html#dict.get – Flowpoke 2011-01-29 00:42:37

您似乎将数字代码映射到字符串消息。使用字典！注意：

_result_msg = { 
    7: result_7, 
    12: result_12, 
    # ... etc 
} 

o = old_last_result 
try: 
    old_last_result_msg = _result_msg[o] 
except KeyError: 
    old_last_result_msg = 'Error code: #%s' % o

来源

2011-01-29 00:30:21 Santa

您可以使用字典：

results = {7: result_7, ..., 1000: result_100} 
old_last_result_msg = results.get(o, "Error code: #%s" % old_last_result)

来源

2011-01-29 00:31:30 Elalfer

EVAL可能是有趣的，你...

i = 7 
result_7 = 'foo' 
print eval('result_%s' % i) 
> foo

来源

2011-01-29 00:38:27

我不会投票，但...真的，**没有**。让糟糕的PHP实践留在PHP ^^中 – 2011-01-29 00:39:29

你可以用当地人（）或全局（）内建构造如下变量：

var res = "result_%d"%o 
if res in locals(): old_last_result_msg = locals()[res] 
else: 
    if res in globals(): old_last_result_msg = globals()[res] 
    else: raise Exception("unexpected result:%s"%res)

来源

2011-12-05 04:57:29 Fei

在Python中，我可以在一个条件中处理两个变量吗？

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