Select file in dialog with python → Display file name in message box

sver='title'

#Module import
import os, tkinter, tkinter.filedialog, tkinter.messagebox

#Display file selection dialog
root = tkinter.Tk()
root.withdraw()
#File format specification. The second argument"*txt"given that
#Only files with the extension txt are displayed.
fTyp = [("*","*")]
iDir = os.path.abspath(os.path.dirname(__file__))
res=tkinter.messagebox.askyesno(sver, 'Select input parameter file. \nSuspend the process if you choose "No"')

#Error message is displayed by selecting Cancel
if res==True:
    file = tkinter.filedialog.askopenfilename(filetypes = fTyp,initialdir = iDir)
    
    if file=='':
        tkinter.messagebox.showerror(sver, "Suspend the process")        
    else:
        #Output of processing file name
        mess='Input file name is \n' + file
        #Message in the box
        tkinter.messagebox.showinfo(sver,mess)        

else:
    tkinter.messagebox.showerror(sver, "Suspend the process")

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