Invalid Syntax error with python v3.5

[paljsingh]

[paljsingh]

Confirmed, that tksheet won't run wit python3.5

$ docker pull davidjfelix/python3.5
...

$ docker run --rm -it --name python35 davidjfelix/python3.5 /bin/bash

---

tksheet installs with python3.5 without issues.

root@075ee9d2111f:/# pip3 install tksheet
You are using pip version 7.1.0, however version 21.0.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
Collecting tksheet
Downloading https://files.pythonhosted.org/packages/49/94/b46edf6f489ca721d843e9601427c05c653261a8f80d6fff41d9dee53dd3/tksheet-5.0.21.tar.gz (74kB)
100% |████████████████████████████████| 77kB 1.2MB/s
Installing collected packages: tksheet
Running setup.py install for tksheet
Successfully installed tksheet-5.0.21

---

but fails when importing.

root@075ee9d2111f:/# echo 'import tksheet' >> test.py

root@075ee9d2111f:/# python3 test.py
Traceback (most recent call last):
File "test.py", line 1, in
import tksheet
File "/usr/local/lib/python3.5/site-packages/tksheet/init.py", line 1, in
from ._tksheet_column_headers import ColumnHeaders
File "/usr/local/lib/python3.5/site-packages/tksheet/_tksheet_column_headers.py", line 696
hw = self.MT.GetHdrTextWidth(f"{data_col + 1}") + 5
^
SyntaxError: invalid syntax

[paljsingh]

Updated README to mention that the app would require python version >= 3.6