How to write dictionary data in memory value directly to s3 bucket as in csv file without writing in file then uploading it

Question

import boto3
import pandas as pd

BUCKET_NAME = ''
ACCESS_KEY_ID = ''
ACCESS_SECRET_KEY = ''
Fraudfilekey = 'fraud_CT_ID_IM_NO/ CT_PROFILE_One_to_Many_Mapping /yyyy=2021/mm=02/dd=05/2021_02_05_CT_TEST.csv'

d = {"A" : ["John","Deep","Julia","Kate","Sandy"],
                     "MonthSales" : [25,30,35,40,45]}
df = pd.DataFrame(d)

s3 = boto3.client('s3', region_name='ap-south-1', aws_access_key_id=ACCESS_KEY_ID,
                  aws_secret_access_key=ACCESS_SECRET_KEY)
def write_to_s3_oneim_to_onect(df):
    s3.put_object(Body=df, Bucket=BUCKET_NAME, Key=Fraudfilekey)

write_to_s3_oneim_to_onect(df)

How can I write dictionary value directly to s3 bucket, I get Body below error raise ParamValidationError(report=report.generate_report()) botocore.exceptions.ParamValidationError: Parameter validation failed: Invalid type for parameter Body, value: A MonthSales

Note: I want Headers col as IM No, CT ID in csv file

Answer 1

There are few ways. One would be to use BytesIO as a memory buffer for the file:

import io

def write_to_s3_oneim_to_onect(df):
    bytes_io = io.BytesIO()
    df.to_csv(bytes_io)
    s3.put_object(Body=bytes_io.getvalue(), 
                  Bucket=BUCKET_NAME, 
                  Key=Fraudfilekey)

Other would be to use s3fs which pandas supports. This would require you to install s3fs and setup AWS credetnails for it to use. But once setup, writing to S3 would be:

def write_to_s3_oneim_to_onect(df):
    df.to_csv(f"s3://{BUCKET_NAME}/{Fraudfilekey}")