Creating a bucket in S3

import boto3
s3 = boto3.client('s3')
s3.create_bucket(Bucket='bucket_name')

Read from S3 File

import boto3

s3 = boto3.resource('s3')
object = s3.Object('bucket_name','key')

bucket_name is the name of the bucket key is the path to the file in the bucket.

s3.Object('bucket_name','key').get()
s3.Object.get('bucket_name','key')

Write to S3 File

import boto3

s3 = boto3.resource('s3')
client = boto3.client('s3')

# using Object.put()
object = s3.Object('bucket_name', 'my/key/fileName.txt')
object.put(Body="new information")

# using client.put_object()
client.put_object(Body="write to file", Bucket='bucket_name', Key='my/key/fileName.txt')

Template

import boto3
import base64

from boto3 import client

def lambda_handler(event, context):
  user_download_img ='Name Of Your Image in S3'
  print('user_download_img ==> ',user_download_img)

  # configure resource location
  s3 = boto3.resource('s3')
  bucket = s3.Bucket(u'Your-Bucket-Name')
  
  #pass your image Name to key
  obj = bucket.Object(key=user_download_img)

  # get Response
  response = obj.get()
  img = response[u'Body'].read()

  # Encoded the image to base64
  myObj = [base64.b64encode(img)]

  # Printing the values
  print(type(myObj))
  # base64 of image
  print(myObj[0])

  # return variable
  return_json = str(myObj[0])

  # repplace this 'b'' is must to get absoulate image.
  return_json = return_json.replace("b'","")
  encoded_image = return_json.replace("'","")

  return {
    'status': 'True',
    'statusCode': 200,
    'message': 'Downloaded profile image',
    'encoded_image':encoded_image          # returning base64 of your image which in s3 bucket.
  }