#!/usr/bin/env python3
#title          :10-2.py
#description    :10.2: User input & exceptions
#author         :Marcel Haazen
#email          :marcel@haazen.xyz
#date           :07-11-2019 - 11:45
#edit_date      :07-11-2019 - 11:54
#version        :0.1
#usage          :python3 10-2.py
#notes          :
#python_version :3.7.4
#==============================================================================
while True:
    try:
        filename = input("Wat is de naam van het bestand? \n")
        assert filename != ""
        filename = filename+".txt"
        file = open(filename, "r")
        n = 0
        i = 0
        li = 0
        for line in file:
            i = i+1
            fields = line.split(",")
            if n < int(fields[0]):
                n = int(fields[0])
                li = li+1
        print("Deze file telt",i,"regels")
        print("Het grootste kaartnummer is:",n,"en dat staat op regel",li+1)
        file.close
        break
    except FileNotFoundError:
        print("Er is geen bestand gevonden met de naam", filename)
    except AssertionError:
        print("Je moet wel een bestands naam invullen he grapjas.")