最好在python

Question

Table = u'''A,This is A 
B,This is B 
C,This is C 
D,This is D 
E,This is E 
F,This is F 
G,This is G 
H,This is H 
I,This is I 
J,This is J''' 

SearchValue = u'''A 
B 
C 
D 
Bang 
F 
Bang 
G 
H''' 

Table = Table.splitlines() 
LineText = {} 
for targetLineText in Table: 
    LineText[targetLineText.split(',')[0]] = targetLineText.split(',')[1] 

SearchValue = SearchValue.splitlines() 
for targetValue in SearchValue: 
    print LineText[targetValue] if targetValue in LineText else 'Error:' + targetValue 

這段代碼是幹什麼獲取字典值的表現...... 它找到值列表從「表」字典的鍵名爲「SearchValue」

我檢查鍵存在以下代碼..

targetValue in LineText 

我想要做的是在關鍵值存在檢查的同時獲取值。因爲我認爲這表現更好。

Answer 1

你應該看看到dict.get方法：

SearchValue = SearchValue.splitlines() 
for targetValue in SearchValue: 
    print LineText.get(targetValue, 'Error:' + targetValue) 

Answer 2

我重新格式化根據the python style guide你的代碼，並增加了一些優化：

table = u'''A,This is A 
B,This is B 
C,This is C 
D,This is D 
E,This is E 
F,This is F 
G,This is G 
H,This is H 
I,This is I 
J,This is J''' 

search_value = u'''A 
B 
C 
D 
Bang 
F 
Bang 
G 
H''' 

line_text = dict(line.split(",") for line in table.splitlines()) 

for target_value in search_value.splitlines(): 
    print line_text.get(target_value, "Error: {0}".format(target_value))