嵌套Dictionary Comprehension语法错误排查：REST API数据清洗

The syntax error you're hitting comes from two small but critical issues in how you're handling the conditions field:

1. You tried to use a dictionary comprehension where you actually need a list comprehension (since the original conditions is a list of objects, not a single dictionary).
2. The structure of your attempted dict comprehension was invalid—dict comprehensions require a single key: value expression before the for clause, not multiple key-value pairs stacked together.

Here's the corrected version of your code:

{
    item['label']: {
        'requiredLevel': item['requiredLevel'],
        'preferableLevel': item['preferableLevel'],
        'conditions': [
            {
                'label': LABEL_REPLACEMENT[condition['label']],
                'function': condition['function'],
                'valueList': condition['valueList']
            } for condition in item['conditions']
        ]
    } for item in tempItems
}

Key Fixes Breakdown: #

• Swapped the curly braces {} around the conditions logic with square brackets [] to create a list comprehension (matching the original list structure of conditions in your API data).
• Each element in the list is a new dictionary that transforms the condition's label using your LABEL_REPLACEMENT mapping, while preserving the original function and valueList values.

Optional Safety Tip: #

To avoid KeyError if a condition's label isn't present in LABEL_REPLACEMENT, you can use the get() method with a fallback to keep the original label:

'label': LABEL_REPLACEMENT.get(condition['label'], condition['label'])

This will prevent your code from crashing if an unexpected label comes through the API.

内容的提问来源于stack exchange，提问作者bl4met