Python的Namedtuple索引实例

问题描述：

所以这是我对我的实验室编码项目代码，我目前的工作：Python的Namedtuple索引实例

from collections import namedtuple 
Restaurant = namedtuple('Restaurant', 'name cuisine phone dish price') 

# Restaurant attributes: name, kind of food served, phone number, best dish, price of that dish 

RC = [Restaurant("Thai Dishes", "Thai", "334-4433", "Mee Krob", 12.50), 
     Restaurant("Nobu", "Japanese", "335-4433", "Natto Temaki", 5.50), 
     Restaurant("Nonna", "Italian", "355-4433", "Stracotto", 25.50), 
     Restaurant("Jitlada", "Thai", "324-4433", "Paht Woon Sen", 15.50), 
     Restaurant("Nola", "New Orleans", "336-4433", "Jambalaya", 5.50), 
     Restaurant("Noma", "Modern Danish", "337-4433", "Birch Sap", 35.50), 
     Restaurant("Addis Ababa", "Ethiopian", "337-4453", "Yesiga Tibs", 10.50)]

我想问你作为一个初学者是：什么方法（S）我应该使用允许我的程序索引列表的特定部分？

例如，我怎么去索引所有的大名单中餐馆的名单？这份名单包括刚刚从列表中餐馆不是所有的其他信息，如电话号码，等...

我都用了分片方式和列表功能在试图弄清楚这一点，我自己并没有证明工作。 > :(

我想我不知道你在这种情况下指数是什么意思？ – Colleen

这是特定的疑问，实验室提出，如果这有助于： –

假设你的意思是'通过“所有餐馆” name'，'RC [0] .name'将是第一项。 – Moshe

答

我不知道，当你说指数如果你只想值或性能，但对于基本检索你可能只是做这样的事情

[r.name for r in RC]

这将使你所有的名字餐厅你在RC

你可以更大胆，

RC = [...] 
def getValues(name): 
    return [getattr(r, name) for r in RC]

然后，你可以这样做，

getValues('name')

如果你需要缓存你可以考虑使用memoize的

答

不能完全肯定你的意思是“指数”，但这可能会做你想要什么：

from collections import namedtuple 
Restaurant = namedtuple('Restaurant', 'name cuisine phone dish price') 

# Restaurant attributes: name, kind of food served, phone number, best dish, price of that dish 

RC = [Restaurant("Thai Dishes", "Thai", "334-4433", "Mee Krob", 12.50), 
     Restaurant("Nobu", "Japanese", "335-4433", "Natto Temaki", 5.50), 
     Restaurant("Nonna", "Italian", "355-4433", "Stracotto", 25.50), 
     Restaurant("Jitlada", "Thai", "324-4433", "Paht Woon Sen", 15.50), 
     Restaurant("Nola", "New Orleans", "336-4433", "Jambalaya", 5.50), 
     Restaurant("Noma", "Modern Danish", "337-4433", "Birch Sap", 35.50), 
     Restaurant("Addis Ababa", "Ethiopian", "337-4453", "Yesiga Tibs", 10.50)] 

def retrieve(records, column): 
    """ return list of values for column from a list of namedtuples """ 
    if records and column not in records[0]._fields: 
     raise ValueError('invalid column name:' + repr(column)) 
    return [getattr(rec, column) for rec in records] 

print retrieve(RC, 'name')

输出：

['Thai Dishes', 'Nobu', 'Nonna', 'Jitlada', 'Nola', 'Noma', 'Addis Ababa']

Python的Namedtuple索引实例

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