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accession2url <- function(x) {
  prefix <- "ftp://ftp.sra.ebi.ac.uk/vol1/fastq"
  dir1 <- paste0("/",substr(x,1,6))
  dir2 <- ifelse(nchar(x) == 9, "",
          ifelse(nchar(x) == 10, paste0("/00",substr(x,10,10)),
          ifelse(nchar(x) == 11, paste0("/0",substr(x,10,11)),
                                 paste0("/",substr(x,10,12)))))
  paste0(prefix,dir1,dir2,"/",x)
}

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import os
from subprocess import check_output
from tempfile import mkstemp
import sys

import boto3
import requests

s3 = boto3.client('s3')

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# -*- coding: utf-8 -*-

"""A simple tool to document how to control AWS resources.

AWS AUTHENTICATION
-------------------

In order to run any of the code below, you need a profile with AWS credentials
set up on your computer. It's very easy to do this. Google how to configure
your profile with boto3, or visit the docs:

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from sqlalchemy.dialects import postgresql

def bulk_upsert(session: Session, 
                items: Sequence[Mapping[str, Any]]):
  session.execute(
    postgresql.insert(MyModel.__table__)
    .values(items)
    .on_conflict_do_update(
      index_elements=[MyModel.id],
      set_={MyModel.my_field.name: 'new_value'},