steam_dupe_detector.py

# Go to https://steamcommunity.com/profiles/76561198009621091/inventory/#250820 which is the inventory for SteamVR for me
# Open the inspect (Ctrl-shift-C)
# This will also resize the window to display everything
# Copy the inventory_page HTML element
# There should be as many hits for "itemHolder" as there are items in this inventory. If not, make sure the JS has fully rendered
# Paste in the line when prompted by the scratch.
import re
from collections import Counter

if __name__ == '__main__':

    html = input("Feed me HTML.")
    assert "inventory_page" in html, "inventory_page not found, not copied from parent element."

    items_count = html.count("itemHolder")
    assert items_count, "No items found when counting itemHolder."

    sources = re.finditer(r"src=\"(\S+)\"", html, re.RegexFlag.DOTALL | re.RegexFlag.MULTILINE)
    sources = [source.group(1) for source in sources]
    counter = Counter(list(sources))
    dupes = [el for el in counter.most_common() if el[1] > 1]
    print(f"{len(dupes)} dupes found:")
    for dupe in dupes:
        print(f"{dupe[0]} appears {dupe[1]} times.")