creates = self.env['sale.order'].search([]) 

sum_amount = 0 

 for creat in creates: 

sum_amount += int(creat.amount_total) 

 docs.append({ 

 'name': creat.name,

 'create_date': creat.create_date,

 'state': creat.state, 

 'amount':creat.amount_total,

 'total_amount':sum_amount, })

Traceback (most recent call last):
File "C:\Users\My-PC\AppData\Local\Programs\Python\Python37-32\lib\site-packages\werkzeug\serving.py", line 303, in run_wsgi
execute(self.server.app)
File "C:\Users\My-PC\AppData\Local\Programs\Python\Python37-32\lib\site-packages\werkzeug\serving.py", line 291, in execute
application_iter = app(environ, start_response)
File "C:\code\odoo\odoo\service\server.py", line 409, in app
return self.app(e, s)
File "C:\code\odoo\odoo\service\wsgi_server.py", line 128, in application
return application_unproxied(environ, start_response)
File "C:\code\odoo\odoo\service\wsgi_server.py", line 117, in application_unproxied
result = odoo.http.root(environ, start_response)
File "C:\code\odoo\odoo\http.py", line 1318, in __call__
return self.dispatch(environ, start_response)
File "C:\code\odoo\odoo\http.py", line 1291, in __call__
return self.app(environ, start_wrapped)
File "C:\Users\My-PC\AppData\Local\Programs\Python\Python37-32\lib\site-packages\werkzeug\middleware\shared_data.py", line 220, in __call__
return self.app(environ, start_response)
File "C:\code\odoo\odoo\http.py", line 1486, in dispatch
result = ir_http._dispatch()
File "c:\code\odoo\addons\auth_signup\models\ir_http.py", line 19, in _dispatch
return super(Http, cls)._dispatch()
File "c:\code\odoo\addons\web_editor\models\ir_http.py", line 22, in _dispatch
return super(IrHttp, cls)._dispatch()
File "c:\code\odoo\addons\http_routing\models\ir_http.py", line 398, in _dispatch
result = super(IrHttp, cls)._dispatch()
File "c:\code\odoo\odoo\addons\base\models\ir_http.py", line 207, in _dispatch
return cls._handle_exception(e)
File "c:\code\odoo\odoo\addons\base\models\ir_http.py", line 177, in _handle_exception
return request._handle_exception(exception)
File "C:\code\odoo\odoo\http.py", line 774, in _handle_exception
return super(HttpRequest, self)._handle_exception(exception)
File "C:\code\odoo\odoo\http.py", line 312, in _handle_exception
raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])
File "C:\code\odoo\odoo\tools\pycompat.py", line 87, in reraise
raise value
File "c:\code\odoo\odoo\addons\base\models\ir_http.py", line 203, in _dispatch
result = request.dispatch()
File "C:\code\odoo\odoo\http.py", line 833, in dispatch
r = self._call_function(**self.params)
File "C:\code\odoo\odoo\http.py", line 344, in _call_function
return checked_call(self.db, *args, **kwargs)
File "C:\code\odoo\odoo\service\model.py", line 97, in wrapper
return f(dbname, *args, **kwargs)
File "C:\code\odoo\odoo\http.py", line 337, in checked_call
result = self.endpoint(*a, **kw)
File "C:\code\odoo\odoo\http.py", line 939, in __call__
return self.method(*args, **kw)
File "C:\code\odoo\odoo\http.py", line 517, in response_wrap
response = f(*args, **kw)
File "c:\code\odoo\addons\web\controllers\main.py", line 1672, in report_routes
html = report.with_context(context).render_qweb_html(docids, data=data)[0]
File "c:\code\odoo\odoo\addons\base\models\ir_actions_report.py", line 722, in render_qweb_html
return self.render_template(self.report_name, data), 'html'
File "c:\code\odoo\odoo\addons\base\models\ir_actions_report.py", line 505, in render_template
return view_obj.render_template(template, values)
File "c:\code\odoo\odoo\addons\base\models\ir_ui_view.py", line 1284, in render_template
return self.browse(self.get_view_id(template)).render(values, engine)
File "c:\code\odoo\addons\web_editor\models\ir_ui_view.py", line 27, in render
return super(IrUiView, self).render(values=values, engine=engine, minimal_qcontext=minimal_qcontext)
File "c:\code\odoo\odoo\addons\base\models\ir_ui_view.py", line 1293, in render
return self.env[engine].render(self.id, qcontext)
File "c:\code\odoo\odoo\addons\base\models\ir_qweb.py", line 59, in render
result = super(IrQWeb, self).render(id_or_xml_id, values=values, **context)
File "c:\code\odoo\odoo\addons\base\models\qweb.py", line 274, in render
self.compile(template, options)(self, body.append, values or {})
File "c:\code\odoo\odoo\addons\base\models\qweb.py", line 353, in _compiled_fn
raise QWebException("Error to render compiling AST", e, path, node and etree.tostring(node[0], encoding='unicode'), name)
odoo.addons.base.models.qweb.QWebException: list indices must be integers or slices, not str
Traceback (most recent call last):
File "c:\code\odoo\odoo\addons\base\models\qweb.py", line 346, in _compiled_fn
return compiled(self, append, new, options, log)
File "<template>", line 1, in template_741_106
File "<template>", line 2, in body_call_content_105
TypeError: list indices must be integers or slices, not str

Error to render compiling AST
TypeError: list indices must be integers or slices, not str
Template: 741
Path: /templates/t/t/div[3]/div/div[2]/ul/span
Node: <span t-esc="docs['total_amount']"/> - - -

I tried calculator all values from sale.order.But have error 
How to fix it? Please help me
Thanks