传递特定错误python [重复]

Question

我正在尝试通过这两个传递一个特定的键错误。

try:    
    per_visit_large_store = 100 * dic_data[mac]['Retail Store']['No. of visit to large store']/float(dic_data[mac]['Total no. of walk_in'])
except KeyError: 'Retail Store'
    pass

和

try:    
    per_visit_large_store = 100 * dic_data[mac]['Retail Store']['No. of visit to large store']/float(dic_data[mac]['Total no. of walk_in'])
except KeyError: 'Retail Store':
    pass

这两者都会分别引发缩进和语法错误。我到底做错了什么？我正在使用 python 2.7

Answer 1

语法不正确，应该是：

try:
    # some code there
except KeyError as e:
    caused_key = e.args[0]
    if caused_key == 'Retail Store':
        pass

在Python Exception tutorial中查看更多信息

祝你好运:)！

Answer 2

正确的语法是：

try:
    ...
except KeyError:
    pass

---

如果你想捕获一个特定的键，那么你需要检查错误信息：

d = {'a':1, 'b':2}
try:
    d['c']
except KeyError as e:
    if e.message == 'c':
        blah
    else:
        raise KeyError, e

这只会在键为“c”时继续代码。如果不是，则会引发错误。