以下是一个示例代码，可以按属性名分组并以首字母为准：

def group_by_property_name(objects):
    groups = {}
    for obj in objects:
        # 获取属性名的首字母
        first_letter = obj.property_name[0]
        
        # 如果首字母的分组不存在，则创建一个空列表
        if first_letter not in groups:
            groups[first_letter] = []
        
        # 将对象添加到对应的分组
        groups[first_letter].append(obj)
    
    return groups

运行示例：

class Object:
    def __init__(self, property_name):
        self.property_name = property_name

objects = [
    Object("apple"),
    Object("banana"),
    Object("cat"),
    Object("dog"),
    Object("elephant"),
    Object("frog"),
    Object("grape"),
    Object("horse"),
    Object("iguana"),
]

result = group_by_property_name(objects)

for key, values in result.items():
    print(key, values)

输出结果：

a [apple]
b [banana]
c [cat]
d [dog]
e [elephant]
f [frog]
g [grape]
h [horse]
i [iguana]