Could not find a version that satisfies the requirement textual (from versions: )

[StolleJay]

I try to install textual on my raspberry pi b+ and get with the pip install textual or sudo pip install textual the following error message:

Could not find a version that satisfies the requirement textual (from versions: )
No matching distribution found for textual

If i try it with pip3 install textual it works but then after creating my first simple app (just a window) it says:

from textual.app import App
ModuleNotFoundError: No module named 'textual'

What do i wrong?
I just want to create a nice GUI with css.
TkInter what i use currently has not really "modern" optics...

OS: Raspbian GNU/Linux 10 (buster) Linux 5.10.103+
Python: 2.7.16
Python 3: 3.7.3

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