import pandas as pd
import os

df = pd.read_csv("ATT_Mobility_Network_Definition_v7.csv", dtype=str)

p = df["Path_ID"].iloc[0]
print("repr(Path_ID):", repr(p))

DEM_DIR = r"c:\users\public\clipped_dems"
path = os.path.join(DEM_DIR, f"{p}.tif")
print("constructed path:", path)
print("exists:", os.path.exists(path))

print("columns:", list(df.columns))