python dict keys to list

 refer to example code

..

dictionary = {"a": 1, "b": 2, "c": 3}

key_iterable = dictionary.keys()

key_list = list(key_iterable)

print(key_list)

..

www.marearts.com

Thank you. 🙇🏻‍♂️

get pdf file list in aws s3 bucket

Get all pdf file list in s3 bucket.

Change extension file name properly.

..

#s3 client

import boto3

from botocore.exceptions import ClientError

s3_client = boto3.client('s3')

ACCESS_KEY = 'key'

SECRET_KEY = 'secret_key'

s3_client = boto3.client(

's3',

aws_access_key_id=ACCESS_KEY,

aws_secret_access_key=SECRET_KEY,

region_name = 'eu-west-1'

)

#get pdf list

paginator = s3_client.get_paginator('list_objects_v2')

pages = paginator.paginate(Bucket='bucket_name')

cnt = 0

pdf_list = []

for page in pages:

for obj in page['Contents']:

#get file name

fn = obj['Key']

#check extension name

if fn[-3:] == 'pdf':

pdf_list.append(fn)

#print count, filename

print(f'cnt:{cnt}, fn:{fn}')

#increase count

cnt += 1

..

other code for search bucket + subfolder

..

operation_parameters = {'Bucket': 'bucket_name','Prefix': 'sub_folder_name'}

pages = paginator.paginate(**operation_parameters)

..

www.marearts.com

thank you.

🙇🏻‍♂️

flatten, unflatten Pytorch, torch, tensor reshape

 flatten -> unflatten

..

#batch, ch, row, col

input_size=torch.empty(10, 1, 256, 256)

print('input shape: ',input_size.shape)

#flatten batch, ch*row*col

reshape = torch.flatten(input_size, start_dim=1)

# reshape = input_size.reshape(-1, 1*256*256)

print('reshape or flatten: ',reshape.shape)

#unflatten batch, ch, row, col

reshape = reshape.reshape(-1,1,256,256)

print('unflatten: ',reshape.shape)

..

input shape:  torch.Size([10, 1, 256, 256])
reshape or flatten:  torch.Size([10, 65536])
unflatten:  torch.Size([10, 1, 256, 256])

Thank you.

🙇🏻‍♂️