Read an object from Alibaba OSS and modify it using pandas python

Question

So, my data is in the format of CSV files in the OSS bucket of Alibaba Cloud. I am currently executing a Python script, wherein:

1. I download the file into my local machine.
2. Do the changes using Python script in my local machine.
3. Store it in AWS Cloud.

I have to modify this method and schedule a cron job in Alibaba Cloud to automate the running of this script. The Python script will be uploaded into Task Management of Alibaba Cloud.

So the new steps will be:

1. Read a file from the OSS bucket into Pandas.
2. Modify it - Merging it with other data, some column changes. - Will be done in pandas.
3. Store the modified file into AWS RDS.

I am stuck at the first step itself. Error Log:

"No module found" for OSS2 & pandas.

What is the correct way of doing it?

This is a rough draft of my script (on how was able to execute script in my local machine):

import os,re
import oss2 -- **throws an error. No module found.**
import datetime as dt
import pandas as pd -- **throws an error. No module found.**
import tarfile
import mysql.connector
from datetime import datetime
from itertools import islice
dates = (dt.datetime.now()+dt.timedelta(days=-1)).strftime("%Y%m%d")
def download_file(access_key_id,access_key_secret,endpoint,bucket):

    #Authentication
    auth = oss2.Auth(access_key_id, access_key_secret)

    # Bucket name
    bucket = oss2.Bucket(auth, endpoint, bucket)

    # Download the file
    try:
        # List all objects in the fun folder and its subfolders.
        for obj in oss2.ObjectIterator(bucket, prefix=dates+'order'):
            order_file = obj.key
            objectName = order_file.split('/')[1]
            df = pd.read_csv(bucket.get_object(order_file)) # to read into pandas
            # FUNCTION to modify and upload
        print("File downloaded")
    except:
        print("Pls check!!! File not read")
    return objectName

Answer 1

import os,re
import oss2 
import datetime as dt
import pandas as pd 
import tarfile
import mysql.connector
from datetime import datetime
from itertools import islice

import io ## include this new library 

dates = (dt.datetime.now()+dt.timedelta(days=-1)).strftime("%Y%m%d")
def download_file(access_key_id,access_key_secret,endpoint,bucket):

    #Authentication
    auth = oss2.Auth(access_key_id, access_key_secret)

    # Bucket name
    bucket = oss2.Bucket(auth, endpoint, bucket)

    # Download the file
    try:
        # List all objects in the fun folder and its subfolders.
        for obj in oss2.ObjectIterator(bucket, prefix=dates+'order'):
            order_file = obj.key
            objectName = order_file.split('/')[1]


            bucket_object = bucket.get_object(order_file).read() ## read the file from OSS 
            img_buf = io.BytesIO(bucket_object)) 

            df = pd.read_csv(img_buf) # to read into pandas
            # FUNCTION to modify and upload
        print("File downloaded")
    except:
        print("Pls check!!! File not read")
    return objectName