迭代字典和列表的python方法是什么? [英] What is the Pythonic way to iterate over a dict of dicts and lists?
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问题描述
我有一个字典，其中包含一些列表和一些字典，如下所示.
I have a dict which contains some lists and some dicts, as illustrated below.
迭代dict并打印出每个顶级dict键的名称和地址对的最有效方式是什么?
What is the most pythonic way to iterate over the dict and print out the name and address pairs for each top level dict key?
谢谢
{
'Resent-Bcc': [],
'Delivered-To': [],
'From': {'Name': 'Steve Watson', 'Address': 'steve.watson@example.org'},
'Cc': [],
'Resent-Cc': [],
'Bcc': [ {'Name': 'Daryl Hurstbridge', 'Address': 'daryl.hurstbridge@example.org'},
{'Name': 'Sally Hervorth', 'Address': 'sally.hervorth@example.org'},
{'Name': 'Mike Merry', 'Address': 'mike.merry@example.org'},
{'Name': 'Jenny Callisto', 'Address': 'jenny.callisto@example.org'}
],
'To': {'Name': 'Darius Jedburgh', 'Address': 'darius.jedburgh@example.org'}
}
推荐答案
一种方法是将单独的dict更改为包含该dict的列表.然后所有条目都可以被视为相同
One way is to change the lone dicts into a list containing the dict. Then all the entries can be treated the same
>>> D = {
... 'Resent-Bcc': [],
... 'Delivered-To': [],
... 'From': {'Name': 'Steve Watson', 'Address': 'steve.watson@example.org'},
... 'Cc': [],
... 'Resent-Cc': [],
... 'Bcc': [ {'Name': 'Daryl Hurstbridge', 'Address': 'daryl.hurstbridge@example.org'},
... {'Name': 'Sally Hervorth', 'Address': 'sally.hervorth@example.org'},
... {'Name': 'Mike Merry', 'Address': 'mike.merry@example.org'},
... {'Name': 'Jenny Callisto', 'Address': 'jenny.callisto@example.org'}
... ],
... 'To': {'Name': 'Darius Jedburgh', 'Address': 'darius.jedburgh@example.org'}
... }
>>> L = [v if type(v) is list else [v] for v in D.values()]
>>> [(d["Name"], d["Address"]) for item in L for d in item ]
[('Steve Watson', 'steve.watson@example.org'), ('Daryl Hurstbridge', 'daryl.hurstbridge@example.org'), ('Sally Hervorth', 'sally.hervorth@example.org'), ('Mike Merry', 'mike.merry@example.org'), ('Jenny Callisto', 'jenny.callisto@example.org'), ('Darius Jedburgh', 'darius.jedburgh@example.org')]
或者是一个班轮版本
[(d["Name"], d["Address"]) for item in (v if type(v) is list else [v] for v in D.values())]
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