将生成器对象转换为字典

Question

这是我的代码:

# library to extract cookies in a http message
cj = cookielib.CookieJar()

... do connect to httpserver etc

cdict = ((c.name,c.value) for c in cj)

这段代码的问题是cdict是一个生成器.但我想简单地创建一本字典.如何更改要分配给字典的最后一行？

Answer 1

使用字典理解.(在Python 2.7中引入)

cdict = {c.name:c.value for c in cj}

例如,

>>> {i:i*2 for i in range(10)}
{0: 0, 1: 2, 2: 4, 3: 6, 4: 8, 5: 10, 6: 12, 7: 14, 8: 16, 9: 18}

这是引入词典理解的PEP.它可能很有用.

如果您使用的是Python 2.7以下的内容.- 构建一个键值对列表并调用dict()它们,就像这样.

>>> keyValList = [(i, i*2) for i in range(10)]
>>> keyValList
[(0, 0), (1, 2), (2, 4), (3, 6), (4, 8), (5, 10), (6, 12), (7, 14), (8, 16), (9, 18)]
>>> dict(keyValList)
{0: 0, 1: 2, 2: 4, 3: 6, 4: 8, 5: 10, 6: 12, 7: 14, 8: 16, 9: 18}

或者只是将您的生成器传递给dict()方法.像这样的东西

>>> dict((i, i*2) for i in range(10))
{0: 0, 1: 2, 2: 4, 3: 6, 4: 8, 5: 10, 6: 12, 7: 14, 8: 16, 9: 18}