On Fri, 13 Nov 2020 12:04:53 -0500, Richard Damon wrote: > On 11/13/20 11:42 AM, ChalaoAdda wrote: >> On Fri, 13 Nov 2020 16:04:03 +0000, Stefan Ram wrote: >> >>> ChalaoAdda <chalao.a...@gmail.com> writes: >>>> On Fri, 13 Nov 2020 15:41:20 +0000, Stefan Ram wrote: >>>>> ChalaoAdda <chalao.a...@gmail.com> writes: >>>>>> I am trying to read a file from askopenfilename outside the >>>>>> function. >>>>>> I am getting blank file name. What am I doing wrong? Here is my >>>>>> code. >>>>> It is possible that you try to read from "pic" before "on_openfile" >>>>> ever was executed. >>>> I didn't get you. I click on the menu item "Open" and then from the >>>> filedialog select a file. And then outside that function I am trying >>>> to read and print the file. >>> I have added two additional statements to your source code: >>> print( "A" ) and print( "B" ). >>> >>> If you now execute this new source code, you might observe that "B" >>> is being printed before "A" is being printed. >>> >>> from tkinter import * >>> from tkinter import filedialog >>> >>> def on_openfile(): >>> print( "A" ) >>> global pic pic = filedialog.askopenfilename() >>> >>> >>> root = Tk() >>> >>> menubar = Menu(root) >>> root.config(menu=menubar) >>> file_menu = Menu(menubar) file_menu.add_command(label="Open", >>> command=on_openfile) file_menu.add_command(label="Exit", >>> command=root.destroy) >>> menubar.add_cascade(label="File", menu=file_menu) >>> >>> >>> print( "B" ) >>> f = open(pic) >>> print(f.read()) >>> >>> root.mainloop() >> Ok. I got the point. So what do I need to do access the variable? How >> do I return a value from that function? >> >> Thanks. > > The problem is that you are accessing the variable BEFORE the box has > been put up and the user clicking on it. That doesn't happen until the > mainloop() call. You need to delay the opening and reading of the file > till the filedialog has been used and returned. > > Perhaps on_openfile could open and read the file.
Ok. Then how do I access the content of the file from outside the function? How can I access return value? Thanks. -- https://mail.python.org/mailman/listinfo/python-list
