My attempt to log into a website and download a specific file has hit a fall.
Specifically, I am logging into this website http://www.gaez.iiasa.ac.at/w/ctrl?_flow=Vwr&_view=Welcome&fieldmain=main_lr_lco_cult&idPS=0&idAS=0&idFS=0
in order so that I can select specific variables and parameters before I download the file and save as an excel or csv.
In particular, I want to toggle the highlighted inputs 
, before selecting the type of crop, water supply, input level, time period, and geographic areas before downloading the file under 'Visualization and Download' button.
For example, I would like to get the data for Wheat (Crop), rain-fed (Water Supply), High (Input Level), 1961-1990 (Time Period, Baseline), United States of America (Geographic Areas). Then I want to save it as an excel file.
This is my code so far:
# Import library
import requests
# Define url, username, and password
url = 'http://www.gaez.iiasa.ac.at/w/ctrl?_flow=Vwr&_view=Welcome&fieldmain=main_lr_lco_cult&idPS=0&idAS=0&idFS=0'
user, password = 'Username', 'Password'
resp = requests.get(url, auth=(user, password))
Perhaps I'm ingrained in the trenches of the entire process to see an easy, viable solution, but any help is greatly appreciated.