类型错误:格式需要映射 [英] Type Error: Format Requires Mapping

问题描述

我有一个字符串和一个对象列表:

I have a string and a list of objects:

gpl = "%(id)s : %(atr)s"

objects = [{'id':1, 'content':[{'atr':'big', 'no':2}]},  {'id':2, 'content': [{'atr':'small', 'no':3}]}]

for obj in objects:
   for con in obj['content']:
       print gpl %(obj,con)

我得到:

TypeError: format requires a mapping

我该如何打印?我正在尝试打印:

How would I print this? I am trying to print:

1 : big
2 : small

谢谢

推荐答案

由于格式字符串使用命名参数:

Since your formatting string uses named parameters:

gpl = "%(id)s : %(atr)s"

您需要在字典中提供键(名称)作为自变量，以引用格式字符串中的命名格式键:

You need to provide keys (the names) in a dictionary as an argument to reference back to named formatting keys in the formatting string:

print gpl % {'id': obj['id'], 'atr': con['atr']}

因此您的代码应为:

for obj in objects:
    for con in obj['content']:
        print gpl% {'id': obj['id'], 'atr': con['atr']}

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