过滤无值的映射

def filter_empty_values(mapping):
    return {key: value for key, value in mapping.items() if value is not None}

# 示例映射
mapping = {
    'key1': 'value1',
    'key2': None,
    'key3': 'value3',
    'key4': '',
}

# 过滤无值的映射
filtered_mapping = filter_empty_values(mapping)
print(filtered_mapping)

{
    'key1': 'value1',
    'key3': 'value3',
}