code: def lookup_image(wildcard):
    
  
    ec2 = get_ec2_resource()
    filter_ = {'Name': 'name', 'Values': [wildcard]}
  
    images = list(ec2.images.filter(Filters=[filter_]))
  
    # Note, can add filtering by Owners as follows
    #  images = list(ec2.images.filter_(Filters = [filter_], Owners=['self', 'amazon']))
  
    assert len(images) <= 1, "Multiple images match " + str(wildcard)
    assert len(images) > 0, "No images match " + str(wildcard)
    return images[0]
docs: Returns unique ec2.Image whose name matches wildcard
    lookup_ami('pytorch*').name => ami-29fa
    
    https://boto3.readthedocs.io/en/latest/reference/services/ec2.html#image
  
    Assert fails if multiple images match or no images match.