Old Python-version used by IDLE

[GeNoS]

Help please:
When I installed Python on my Raspian stretch, Python 3.5.3. was the most actual version. After starting IDLE it shows " Python 3.5.3 (/usr/bin/python3)" in the shell window.
I have now installed the new Python 3.7.3. version, but IDLE still uses the old Python-version.
Can I change this some how, because I need f""-strings?
Any help is welcome, Gerd

[Gribouillis]

How do you start idle? Try

python -m idlelib

[snippsat]

I have now installed the new Python 3.7.3. version, but IDLE still uses the old Python-version.

From command line python3 -V and pip3 -V,see if point to 3.7.
Look at this post to use alias so that python -V point to 3.7.
Can aslo look at my tutorial here pyenv Simple Python Version Management .

[metulburr]

could try this
https://stackoverflow.com/questions/3998...dle-to-3-5

[GeNoS]

I have now installed the new Python 3.7.3. version, but IDLE still uses the old Python-version.

From command line python3 -V and pip3 -V,see if point to 3.7.
Look at this post to use alias so that python -V point to 3.7.

Hello snippsat,
I tried both commands:
pi@raspberrypi:~ $ python3 -V
Python 3.7.3
pi@raspberrypi:~ $ pip3 -V
pip 19.0.3 from /usr/local/lib/python3.7/site-packages/pip (python 3.7)
They both look ok to me.
I will look at your tutorial next.

[snippsat]

Yes it looks okay,the IDLE should start with:

python3 -m idlelib

Or look at a better REPL shell ipython or ptpython,not many like IDLE.
Editor VS Code from start,also look at Mu which is popular to use with Raspberry-Pi.

[GeNoS]

Thanks snippsat,
I just tried pyenv but I see no possibility to install Thonny too.
Because i'm a newbie I use the windows version and start all application by the menu.
"python3 -m idlelib" started indeed IDLE with Python 3.7.3 but from the application menu it still starts 3.5.3 (the old version). Is there no place where I can tell IDLE which Python to start. It seems to me a very simple thing to do.
Regards, Gerd

[Gribouillis]

from the application menu it still starts 3.5.3

There must be some way to configure the applications menu. It is not a question about python. Find how to add an entry in the applications menu.