Python Write Temp File to S3

I am currently trying to write a dataframe to a temp file and then upload that temp file into an S3 bucket. When I run my code there currently isn't any action that occurs. Any help would be greatly appreciated. The following is my code:

import csv
import pandas as pd
import boto3
import tempfile
import os 

s3 = boto3.client('s3', aws_access_key_id = access_key, aws_secret_access_key = secret_key, region_name = region)

temp = tempfile.TemporaryFile()
largedf.to_csv(temp, sep = '|')
s3.put_object(temp, Bucket = '[BUCKET NAME]', Key = 'test.txt')
temp.close()