Bug or my misunderstanding?

[MrSteveVee]

Hi all, I am trying to get to grips with Python using Visual Studio 2017 on Windows 10 and have a problem that may be a bug in VS or my misunderstanding of an import concept.

If I use the following code (snippet) on the line "name =" I get the error that tkinter does not contain filedialog

import tkinter as TK
....
name = TK.filedialog.askopenfilename()

However, if I add one extra line as follows it now works fine, but I cannot see how the 2nd line added can effect the "name = " line that failed the first test

import tkinter as TK
from tkinter.filedialog import askopenfilename
....
name = TK.filedialog.askopenfilename()

Is this a problem with visual studio and Python or have a misunderstood the import directive

Thanks in advance