It’s missing as the most of tools and applications in Pi 64-bit Buster, so far (Sep 2020), but it could be handy. So, idle3 could be back with:
sudo apt install idle
Source: Missing Python 3 Idle in the Programming Menu – Raspberry Pi Forums
It’s missing as the most of tools and applications in Pi 64-bit Buster, so far (Sep 2020), but it could be handy. So, idle3 could be back with:
sudo apt install idle
Source: Missing Python 3 Idle in the Programming Menu – Raspberry Pi Forums