Why do I get a AttributeError in this code?

Question

I am using python 3.9

I have a class called ImageMetaData

class ImageMetadata(BaseModel):
 title: Optional[str] = None
 source: Optional[str] = None
 sourcesubtype: Optional[str] = None
 filesize: Optional[int] = None
 url: Optional[str] = None

and a function

def total_filesize(images: List[ImageMetadata]):
 total = 0
 try:
 for i in images:
 total = total + i.filesize
 except BaseException as ex:
 logger.error("Caught exception trying to compute total filesize for images", exc_info=True)
 return total

I get an error about AttributeError:

‘dict’ object has no attribute ‘filesize’

Am I missing something?

Answer 1

"filesize" is a dictionary key, not an attribute. Use i["filesize"], not i.filesize. This is not the same.

Answer 2

You should modify the function total_filesize. Try like this:

def total_filesize(images: List[ImageMetadata]):
 total = 0
 
 try:
 for i in images:
 total = total + i["filesize"]
 
 except BaseException as ex:
 logger.error("Caught exception trying to compute total filesize for images", exc_info=True)
 return total