'解包的值太多'，迭代一个字典.键=> 字符串，值=> 列表 [英] 'too many values to unpack', iterating over a dict. key=>string, value=>list

问题描述

我收到 'too many values to unpack' 错误.知道如何解决这个问题吗?

I am getting the 'too many values to unpack' error. Any idea how I can fix this?

first_names = ['foo', 'bar']
last_names = ['gravy', 'snowman']

fields = {
    'first_names': first_names,
    'last_name': last_names,
}        

for field, possible_values in fields:  # error happens on this line              

推荐答案

Python 2

您需要使用类似 iteritems.

for field, possible_values in fields.iteritems():
    print field, possible_values

请参阅此答案，了解有关迭代字典的更多信息，例如使用 items()，跨 python 版本.

See this answer for more information on iterating through dictionaries, such as using items(), across python versions.

由于 Python 3 iteritems() 是 不再支持.改用 items().

Since Python 3 iteritems() is no longer supported. Use items() instead.

for field, possible_values in fields.items():
    print(field, possible_values)

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