[issue34313] Tkinter crashes with Tk-related error on macOS with ActiveTcl 8.6

[royf]

royf <roy.d.fox at gmail.com> added the comment:

I started having a similar issue after updating to macOS Mojave 10.14.6.

I'm not using idle, but the following minimal code has a similar issue:
```python
import tkinter as tk

w = tk.Tk()
w.mainloop()
```
The crash happens on `mainloop`.

This worked for me on macOS <= 10.14.5, but started crashing after updating to macOS 10.14.6. I'm using miniconda with conda=4.7.10, python=3.7.3, and tk=8.6.8.

The above code does work fine on the macOS 10.14.6 in a conda environment with python=3.6.2 and tk=8.5.18. But I really want to use python 3.7, which requires tk>=8.6.8, at least on the default conda channels.

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nosy: +royf

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34313>
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