This question was asked 11 years ago and I am answering it today. :)

STEPS:

1. Downloaded "Source Code Pro"
2. Installed it per instructions
3. PyScripter "tools" Tab > Options > Editor options
4. Select "Source Code Pro" from list of fonts
5. Select Style and Size
6. Press OK to accept Font options
7. Press OK to accept Edition options and apply settings to current environment
8. Source Code Pro will be the default font!