import json h = [] with open("curva.txt", "r") as f: for linea in f: if "HValue" in linea: partes = linea.strip().split("=") h_val = float(partes[1]) h.append(h_val) print(h) with open("h_values.json", "w") as json_file: json.dump(h, json_file, indent=4)