your idea awesome...thank you so much you made my day.

i just changed this line rec.x_css = '<style> .o_form_button_edit {display:None}</style>'

Yea..That's Correct
Missed while copying I guess,

In Py

x_css = fields.Html(
sanitize=False,
compute='_compute_css',
store=False,
)

def _compute_css(self):
for rec in self:
# To Remove Edit Option
if self.env.user.has_group('module_name.group_name') and rec.state != 'draft' :
rec.x_css ='<style>.o_form_button_edit {display: none !important;}</style>'
else:
rec.x_css = False

In XML

<field name="x_css" force_save="1" nolabel="1"/>