from docx import Document
from docx.shared import RGBColor
document = Document()
run = document.add_paragraph().add_run('some text')
font = run.font
font.color.rgb = RGBColor(66, 36, 233)
p = document.add_paragraph('aaa')
document.save('demo1.docx')
Write text in particular font color in MS word using python-docx