user = 'Username'
prefix = user + ': '
preferredWidth = 70
wrapper = textwrap.TextWrapper(initial_indent=prefix, width=preferredWidth,
    subsequent_indent=' ' * len(prefix))
message = 'LEFTLEFTLEFTLEFTLEFTLEFTLEFT RIGHTRIGHTRIGHT ' * 3
print(wrapper.fill(message))
Printing with indentation in python