Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: YASHICA FX-3 SUPER 2000 CAMERA W/YASHICA ML 50MM
Product description: Film camera
Product feature: Yashica FX 3, Supper 2000, Film, manual, Camera SLR
Product price: $88.90
Product brand: Yashica
Target attributes: Weight
Answer: attribute: weight
value: None
source: None