Tkinter & matplotlib

[Larz60+]

Again:
The error is:

Error:
Exception in Tkinter callback
Traceback (most recent call last):
  File "/home/captainkirk/.pyenv/versions/3.7.4/lib/python3.7/tkinter/__init__.py", line 1705, in __call__
    return self.func(*args)
  File "/media/captainkirk/Data-3TB/projects/T-Z/T/TryStuff/src/PyMatplotlib.py", line 17, in inputik
    nPoints = int(pocetbodu_entry.get())
NameError: name 'pocetbodu_entry' is not defined

Which very clearly states that 'pocetbodu_entry' is not defined

I suggest that you run step by step through a debugger and watch the program flow.