I passed these variables to python-terraform wrapper (https://github.com/beelit94/python-terraform)

#!/bin/python
import json
from pprint import pprint
from python_terraform import *




def myfunc():

  tf = Terraform(working_dir='/home/ja/terraform-course/demo-2b', variables={'count':count,'INSTANCE_USERNAME':user})
  tf.plan(no_color=IsFlagged, refresh=False, capture_output=False)
  approve = {"auto-approve": True}
  print(tf.plan())
  print(tf.apply(**approve))
  return

    json_data=open('./my.json')
    data = json.load(json_data)
    
    json_data.close()
    
    for i in range (0, len (data['customers'])):
        #print data['customers'][i]['email']
        k=data['customers'][i]['email']
        #print(k.split('@')[0])
        user=k.split('@')[0]
        #print(user)
        count=data['customers'][i]['instances']
        #print(count)
        #enter = int(input('Enter number of instances: '))
        myfunc()

When creating manually i got

Terraform will perform the following actions:

-/+ aws_instance.win-example (new resource required)
      id:    

                   "i-073bda5b30f10d3ba" => <computed> (forces new resource)

I passed these variables to python-terraform wrapper (https://github.com/beelit94/python-terraform)

#!/bin/python
import json
from pprint import pprint
from python_terraform import *




def myfunc():

  tf = Terraform(working_dir='/home/ja/terraform-course/demo-2b', variables={'count':count,'INSTANCE_USERNAME':user})
  tf.plan(no_color=IsFlagged, refresh=False, capture_output=False)
  approve = {"auto-approve": True}
  print(tf.plan())
  print(tf.apply(**approve))
  return

    json_data=open('./my.json')
    data = json.load(json_data)
    
    json_data.close()
    
    for i in range (0, len (data['customers'])):
        #print data['customers'][i]['email']
        k=data['customers'][i]['email']
        #print(k.split('@')[0])
        user=k.split('@')[0]
        #print(user)
        count=data['customers'][i]['instances']
        #print(count)
        #enter = int(input('Enter number of instances: '))
        myfunc()

windows.tf:

resource "aws_key_pair" "mykey" {
  key_name = "mykey"
  public_key = "${file("${var.PATH_TO_PUBLIC_KEY}")}"
}

resource "aws_instance" "win-example" {
  ami = "${lookup(var.WIN_AMIS, var.AWS_REGION)}"
  instance_type = "t2.medium"
  count="${var.count}"

  key_name = "${aws_key_pair.mykey.key_name}"
  user_data = <<EOF
<powershell>
net user ${var.INSTANCE_USERNAME} '${var.INSTANCE_PASSWORD}' /add /y
net localgroup administrators ${var.INSTANCE_USERNAME} /add

winrm quickconfig -q
winrm set winrm/config/winrs '@{MaxMemoryPerShellMB="300"}'
winrm set winrm/config '@{MaxTimeoutms="1800000"}'
winrm set winrm/config/service '@{AllowUnencrypted="true"}'
winrm set winrm/config/service/auth '@{Basic="true"}'

netsh advfirewall firewall add rule name="WinRM 5985" protocol=TCP dir=in localport=5985 action=allow
netsh advfirewall firewall add rule name="WinRM 5986" protocol=TCP dir=in localport=5986 action=allow

net stop winrm
sc.exe config winrm start=auto
net start winrm
</powershell>
EOF

  provisioner "file" {
    source = "test.txt"
    destination = "C:/test.txt"
  }
  connection {
    type = "winrm"
    timeout = "10m"
    user = "${var.INSTANCE_USERNAME}"
    password = "${var.INSTANCE_PASSWORD}"
  }

tags {
Name="${var.INSTANCE_USERNAME}"
}
}