在Python中，我可以在一個條件中處理兩個變量嗎？

可以簡化這個嗎？也許把兩者結合起來？告訴我DRY的方法： - \在Python中，我可以在一個條件中處理兩個變量嗎？

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

來源

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)

來源

2011-01-29 00:30:23

甜。剛剛擡起頭.get（）http://docs.python.org/library/stdtypes.html#dict.get – Flowpoke 2011-01-29 00:42:37

您似乎將數字代碼映射到字符串消息。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

來源

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)

來源

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

來源

2011-01-29 00:38:27

我不會投票，但...真的，**沒有**。讓糟糕的PHP實踐留在PHP ^^中 – 2011-01-29 00:39:29

你可以用當地人（）或全局（）內建構造如下變量：

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)

來源

2011-12-05 04:57:29 Fei

在Python中，我可以在一個條件中處理兩個變量嗎？

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