Convert a text file from UTF-8 encoding to ANSI using Python in AWS Glue

Overview:

To convert a text file from UTF-8 encoded data to ANSI using AWS Glue, you will typically work with Python or PySpark. However, it’s important to understand that ANSI is not a specific encoding but often refers to Windows-1252 (or similar 8-bit encodings) in a Windows context.

AWS Glue, running on Apache Spark, uses UTF-8 as the default encoding. Converting to ANSI requires handling the character encoding during the writing phase, because Spark itself doesn’t support writing files in encodings other than UTF-8 natively. But there are a few workarounds.

Here’s a step-by-step guide to convert a text file from UTF-8 to ANSI using Python in AWS Glue, assuming you’re working with a plain text file and want to output a similarly formatted file in ANSI encoding.

General Process Flow:

Technical Approach Step-By-Step guide:

Step1: Add the import-statements to the code

import boto3
import codecs

Step2: Specify the source/target file paths & S3 bucket details

# Initialize S3 client
s3_client = boto3.client('s3')
s3_key_utf8 = ‘utf8_file_path/filename.txt’
s3_key_ansi = 'ansi_file_path/filename.txt'

# Specify S3 bucket and file paths
bucket_name = outgoing_bucket #'your-s3-bucket-name'
input_key = s3_key_utf8   #S3Path/name of input UTF-8 encoded file in S3
output_key = s3_key_ansi  #S3 Path/name to save the ANSI encoded file

Step3: write a function to convert the text file from UTF-8 to ANSI, based on the parameters supplied (S3 bucket name, source-file, target-file)

# Function to convert UTF-8 file to ANSI (Windows-1252) and upload back to S3
def convert_utf8_to_ansi(bucket_name, input_key, output_key):
    # Download the UTF-8 encoded file from S3
    response = s3_client.get_object(Bucket=bucket_name, Key=input_key)
    # Read the file content from the response body (UTF-8 encoded)
    utf8_content = response['Body'].read().decode('utf-8')
    # Convert the content to ANSI encoding (Windows-1252)
    ansi_content = utf8_content.encode('windows-1252', 'ignore')  # 'ignore' to handle invalid characters
    # Upload the converted file to S3 (in ANSI encoding)
    s3_client.put_object(Bucket=bucket_name, Key=output_key, Body=ansi_content) 

Step4: Call the function that converts the text file from UTF-8 to ANSI

# Call the function to convert the file 
convert_utf8_to_ansi(bucket_name, input_key, output_key) 

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